Sunday, October 4, 2015

A Serious Agate Find in Baltimore County, Maryland

Definitive banding and translucency are disinctive characteristics of  the only true Maryland agate find of which we are aware.  The locality appears to be around a contact point  between siliceous (quartz) rock and  serpentinite  rock within a small  plot between I-70 and  Catonsville where a Baltimore County geological map shows serpentinite to be dominant.

The metamorphosed quartz rock is rich in iron. Drusy quartz, often nodular, is frequently present, often on the surface of these rocks, and it fills vugs  inside them.  Banding is occasionally apparent, especially inside the particularly vuggy rocks.   Much of the material is similar to that collected half a century ago during the construction of I-70. The specimen pictured at right, which well-known Baltimore County collector Bob Eberle brought home from I-70  in the late 1960's, boasts  coatings of opal (var.) hyalite.

Shown at left is an example of the more recently discovered material before  being sawed or polished. When viewed under the scope, its banding appears as minute vugs filled with an iron rich quartz druse and other ferrous material as pictured in the   photomicrograph at right.

 A clearer macrocrystalline quartz druse accounts for  the translucency evident on  polished slabs as well as blue to
purple banding  in the images beneath our title post. This becomes evident when viewing the photomicrograph at left, which also suggests that the green color could bespeak sand grains at early stages of tectonic compression.

A potential for questioning the legitimacy of agate nomenclature asserts itself in various official definitions that specifically categorize agate as cryptocrystalline  with conchoidal fracture.  While a limited amount of chalcedony is present in a few of the Baltimore County specimens as shown at right,  most are primarily  quartzite with a healthy presence of macrocrystalline quartz.

 For clarification, we contacted John S.White, Past Curator-in- Charge of of the National Gem and Mineral Collection at the Smithsonian as well as one of the world's most frequently published authors on questions relating to the integrity of species nomenclature. His response:
 I have seen lots of agate boulders split without them exhibiting conchoidal fracture.  However, a chip from them might well do so.  In any case, if this is quartz and it exhibits colorful banding, then I see no problem with calling it agate.  Lots of agate has bands that are colorless quartz xls, especially on the inside of nodules as the very last thing to grow.  Quite often “agate” is in the eye of the beholder and lots of stuff that you nor I might not care to call agate is called agate by those who have it.  This material does appear to be banded and very colorful and I would not mind having a cab of it myself.

Clearly, the banding and the translucency define the material as agate. They also raise questions relating to Maryland's Official State Gemstone, known as "Patuxent River Stone" and described on the State of Maryland's Kid's Page as follows:
The Patuxent River Stone is actually an agate, a cryptocrystalline form of quartz. Found only in Maryland, the Patuxent River Stone's  colors of red and yellow reflect the Maryland State Flag. 
 Patuxent River Stone, of course, is neither banded nor cryptocrystalline. Even worse, until after the publication of our previously referenced post about Patuxent River Stone on October 29, 2010, it  was still being called"agatized dinosaur bone”  as well. In truth, Patuxent River Stone is nothing more than quartzite with some red and yellow hues.

Wednesday, September 9, 2015

A Major Quartz Crystal Find in Baltimore County,Maryland

During the past year as construction crews were clearing and digging, the now  built over and/or  grown over and off-limits construction site pictured above  near Owings Mills was the site of what could have been the State of Maryland’s most exciting and prolific quartz crystal bonanza ever.  For those with permission to collect and who knew what they were doing, the former construction site yielded notably diverse milky, clear, smoky and amethystine quartz crystal specimens including small clusters and individual crystals, most that were  doubly-terminated, and some with  Cumberland habits as well as a few scepters.

Members of the Chesapeake Gem and Mineral Society, the Baltimore Mineral Society, the Gemcutters Guild of Baltimore, and others  collected  tens  of thousands of quartz crystal specimens. The crystals displayed  by Mark Ruzicka, a Catonsville home improvement contractor pictured with his son Mason and daughter Ashley, bespeak but a fraction of the quantity of specimens they collected in just over a year. Prominent Baltimore County collectors Bob Eberle and Bernie Emery,  the a latter who first informed  Mineral Bliss of the find, collected nearly as many.

Richard Hoff, the immediate Past President of the Chesapeake Gem and Mineral Society, who is pictured at right exploring a crystal pocket, estimates that he collected about 30,000 specimens. Everyone  agrees that the kinds of crystal specimens they fsound changed through different stages of work by an accommodating construction crew.

In the early spring of 2014, the removal of trees from the site uncovered huge quartz boulders bearing numerous milky quartz
crystals. By late spring,  construction crews had removed enough earth to level the entire area, piling the dirt into a mound about 30 yards long,  8 yards wide, and  5 yards high. From these mounds, collectors uncovered plates of quartz bearing multiple crystals measuring to well over an inch. Most of these crystals were milky, some of them clear. Encrustations of dried clay were present on many of the specimens. A different mode of collecting began to evolve around the Fourth of July.

Richard Hoff was there the day that Jim Hooper, President of the Baltimore Mineral Society, wandered a few yards south from the dirt mound and found a single doubly-terminated quartz crystal measuring about an inch and a half. It was embedded in a two foot embankment where a road would later be cut. Almost immediately, Hoff and the other collectors who were present began digging a short distance from the embankment and eventually found more crystals. They dubbed the hole that produced them as “the Hooper pocket.”

In the Hooper pocket and various other holes that struck pay dirt, they typically first encountered small plates of crystals about a foot beneath the surface. As they dug slightly deeper. they found more clustered and individual  crystals.  Some of them hinted at the potential for star patterns as portrayed in the amethystine crystals pictured at left  . Hoff referred to them as “spider legs.” Lots of smokies were in the mix.

Many crystals appeared at first to be floaters. Upon close examination, however, contact points became evident, except where weathered away.  The image at right from a plate of scepter-like crystals provides a hint as to where and how many such crystals could have originated.

The site is near the southwestern edge of a gneiss formation known as the Chattalonee Dome that extends west from Falls Road to about a mile north of Randallstown. In that same area,  a  Johns Hopkins foliation and bedding map of the Chattalonee Dome shows in the general area of the crystal pockets two small patches of fault breccia that is consistent with the micaceous dirt and clay from which the crystals were extracted.  Hoff theorizes that over hundreds of millions of years, both liquid siliceous material and fault breccia filled pockets where feldspar from the Chattalonee Dome gneiss had deteriorated and that crystals began to form that later experienced numerous stages of growth. He suggests that interference from fault breccia material, which also displayed a significant presence of iron (goethite, limonite, and pyrite in specks and tiny crystals) could have accounted for the "spider leg phenomenon. Pictured above at left is one of his less common finds: a golden pyrite cube included within a clear quartz crystal.

Hoff’s  thoughts regarding the science behind these  Owings Mills crystals speak for an innate curiosity and a passion for collecting. Like most who became fascinated with these crystals, he believes that the locality deserves study in academic circles. The opportunity is more than available with the myriad   crystals that Hoff, Ruzicka, and so many others have saved.  Both Hoff and Ruzicka can be reached by email to provide specimens.

Sunday, August 16, 2015

The 2015 East Coast Gem, Mineral and Fossil Show

The experience of attending Martin Zinn's annual East Coast Gem, Mineral, and Fossil Show at the Better Living Center of the Eastern States Exposition in West Springfield, Massachussetts is much the same from year to year and a high point for most  most serious East Coast collectors. This year's show ran from Friday August 7 through Sunday, August 9.  As always, we made a point of attending on Friday, which is less crowded and offers attendees a first shot at the bounty for sale. 

As at any large show, there are magnificent as well as ugly mineral specimens to see and to purchase from different dealers selling comparable material at prices all over the map with plenty of bargains in the mix.  The show also provides a great opportunity to catch up with mineral friends well as to learn about new East Coast finds.

Prominent among a limited number of such new East Coast finds available for purchase this year
were the amethyst crystals that Jason Baskin was offering at Jay's Minerals.  He had recently uncovered them from  a pocket in Windham County, Connecticut. Jason deferred on   information regarding a more specific locality in that county pending publication of an article he is writing for a major mineralogical publication. Mostly small single crystals  or aggregates of such crystals,  their color and clarity were impressive. Prices began at less than $10. This was the second year in a row that Jason has featured a new East Coast find. Last year's was a distinct genre of pyrope-almandine garnets in graphite from Erving, Massachussetts, of which he still had plenty in stock.

Another purveyor, Geologic Desires, can also be counted upon year after year to have its share of exclusive East Coast genres collected near its home base in St. Lawrence County, New York.  That's because owner Michael Walter has obtained exclusive privileges to collect on select private farms in that county.  These localities have yielded  an impressive supply of killer tourmaline (var.) dravite such as shown at left, as well as good peristerite, diopside, uvite, and hexagonite. Michael also has for sale an attractive selection of worldwide minerals.

The show is also certain to have at least a booth or two featuring private collections from which buyers can cherry-pick. This year, Lambert Minerals had such a booth, pretty much the entirety of which offered specimens from the collection once owned by Peter Duncan, a resident of Ottawa, Canada. Among them was the one pound, two ounce brazilianite cluster pictured at right.

For the greatest number of bargains, no other dealers could begin to compete with the hundreds of  keystone (that's half price) specimens offered by Dan and Diane Weinrich. Shoppers were scarfing them up as fast as Dan and Diane could pull them out of flats to place on tables adjacent to cabinets bearing world class specimens priced as high as $40 grand. The Weinrich's have  similar bargain tables each February at Tucson in a room adjacent to the lobby at the Tucson City Center Hotel (Inn Suites) during the two weeks before the action moves to the city's Convention Center. Always prominent among the Weinrich bargains are excellent specimens of calcite and chalcopyrite from the thousands they have been able to source from miners at the Sweetwater Mine at Viburnum Trend in Reynolds County, Missouri. Just as notable, though smaller and fewer in number, are  rare species that consistently find their way to these bargain tables. We  noticed  specimens of  keckite, bobdownsite, dickthomssenite, and shcherbakovite,

At this and numerous shows all over the world, German rare species dealer Gunnar Farber  always has available the widest selection of rare species, some obscure enough to be completely off the radar of the most knowledgeable collectors. Some have only  recently been approved by the International Mineralogical Association and subsequently  published.  Also, more than several specimens from various localities in Chile and at least one this year from Canada can always be found displayed for sale in front of a sign that reads "discovered by me."

Kristalle, which is based in Laguna Beach, California, is high-end to  the point that only the most well-heeled collectors are in a position to do more than gawk when checking out what's for sale in its glass cabinets.  However, at the far end of one cabinet were several specimens that we found to be inordinately affordable, Two were Pennsylvania pieces including the hemimorphite shown at left from Friedensville in Lebanon County's Saucon Valley. While far from comparable to the ubiquitous as well as spectacular hemimorphite specimens from several localities in Mexico, specimens of the quality pictured at right, when from Pennsylvania, are viewed by that state's cognoscenti as a treasure. Standing nearby was the well-known Pennsylvania collector Joe Polytka in the midst of taking notes for the article he writes about the East Coast show each year for Mineralogical Record.  He described the Friedensville hemimorphite pictured at left as "something you don't see anymore." The $60 price tag was a relatively miniscule fraction of the amount that Kristalle asks and is paid for the vast majority the specimens it offers for sale.

Numerous specimens at this show, mostly from high end dealers, are comparable in quality, value, and aesthetics to those in the 50 cabinet display that greets showgoers as they enter the building. These exhibits always represent a private collection of a renowned collector.  This year's display featured specimens from the personal collection of Marty Zinn,  promoter of this show and others, including the famous Arizona Mineral and Fossil Show in February at the aforementioned Tucson Hotel City Center (Inn Suites), It tends to stop many showgoers in their tracks as they enter. Others are more eager to keep moving to reach the bargains as soon as possible,  then enjoy the exhibits upon leaving.

Wednesday, July 22, 2015

A Truly Great Overlooked Maryland Locality

Deserving  serious recognition in Maryland's mineralogical circles for the specimens it once yielded is the defunct Farmers Cooperative Limestone Quarry near the crossroads of New London in Frederick County. The quarry, which produced a dolostone primarily of Wakefield Marble laced with phyllite, ceased operations in 1973. 

The locality found its way to Mindat  thanks to Dr. William Cordua,  now retired  as Professor of Geology at the University of Wisconsin. Over the past 30 years, Dr. Cordua has written more than 50 professional publications, most relating to Wisconsin's geology and/or mineralogy. Among them is  a compendium of Wisconsin species that appeared in  Rocks and Minerals. More thorough is the database of Wisconsin minerals he maintains for the Wisconsin Geological and Natural History Survey. Now a member of Mindat's Management Group, he has enhanced that site's listings for species and/or localities in nine other states, including  Maryland's  Farmers Cooperative Limestone Quarry. Dr. Cordua collected there between 1967 and 1969 while  a geology student living near Washington DC.

He recently decided to  "de-acquisition" some of his collection.  Included were the specimens he collected at Farmers Cooperative,  His wish was for them to “wind up with people who appreciate Maryland minerals.”

The suite appears worthy of consideration as one the most interesting and significant Maryland mineralogical finds in last 50 years. We are not aware of a more aesthetically pleasing Maryland-collected aurichalcite specimen  than the one pictured in our title image. Somewhat visually drowned  out  by virtue of colorless transparency are numerous well defined accompanying hemimorphite crystals. The image at right better captures similar crystals from  another rock in the suite. As with the aurichalcite, we are unaware of a better example of what little Maryland hemimorphite is known to exist.

None of the specimens  in the suite amazed us more than the
transparent green sphalerite crystals on calcite pictured at left. Of obvious gem quality, these crystals form an aggregate extending about  8 centimeters. 

Also significant and pictured at right is green/gray botryoidal crystalline smithsonite inside a 6.5 millimeter vug at a contact point with quartz. It is in a rock richly graced with sparkling blebs of galena. Interestingly, galena is not one of the more abundant species among the primary ore minerals from Farmers Cooperative. Far more common are sphalerite, bornite, and chalcopyrite.

 All  three aforementioned sulfides are ubiquitous in thin ore filled veins occasionally running through the Wakefield Marble for which the quarry was mined. Less common and found separately, were crystals of chalcopyrite, rare in Maryland, especially in association with calcite. The several examples that Dr. Cordua collected  rested on marble topped by drusy calcite, as pictured at left..

Of particular interest is  the specimen shown in the photomicrograph at right. The main crystal is goethite pseudomorph after chalcopyrite with epitaxial prisms of malachite. As most of the malachite from  the quarry was of  was of a darker green hue, Dr. Cordua had originally suspected that these beautiful crystals could be dioptase.

Farmers Cooperative Limestone Quarry is not mentioned in The Natural History Society of Maryland's 1940  Minerals of Maryland, by Ostrander and Price. We suspect the quarry may not  have existed then. However, it is one of but two Frederick County localities mentioned in Maryland Geological Survey's 1981 Minerals of the Washington, DC Area by
Lawrence Bernstein. Among minerals observed in Dr. Cordua's suite  that we have not covered but are are listed in that publication are baryte, hematite, manganese oxides (pyrolusite) as dendrites, and chlorite. Bernstein also noted calcite crystals, but may not have been aware that some of the smaller ones werer as beautiful as the twins  in the image at left, which  Dr. Cordua shot.

Bernstein did not mention hydrozincite, It occurs in white crusts that are less than remarkable to observe until placed under shortwave ultraviolet light as shown  at right.

Minerals of the Washington DC Area  does  mentions gold, cuprite, linarite, and rosasite, all on the basis of "oral communication." The late Herb Corbett provided the oral communication regarding rosasite, which he described as "crusts of tiny green crystals."  However, an x-ray analysis that Dr. Cordua submitted.suggests that this material was aurichalcite, which the book did not mention.

Another publication with particularly interesting information regarding the geology of Farmers Cooperative is  Heyl and Pearre's 72 page Copper, Zinc, Lead, Iron, Cobalt, and Barite Deposits in the Piedmont Upland of Maryland, published in 1965 by the  Maryland Geological Survey. Minerals it names from Farmers Cooperative include are limited to  sphalerite, galena, chalcopyrite "and their oxidation products."  These "sulfides, Heyl and Pearre noted, "occur as replacements of the (Wakefield) marble at the contact of the adjacent Ijamsville Phyllite, and in thin replacement veins, bunches and stringers within the marble band."  The veins, they added, are similar to those at the New London (copper) Mine.

It is intriguing how many species species included in Dr. Cordua's suite have been reported  at three nearby long defunct and grown or built over localities: the aforementioned New London Copper Mine; the Unionville Zinc Mine; and the the Mountain View Lead Mine.. All of these localities, along with Farmers Cooperative Limestone Quarry, are  located within a few miles of each other. The ore and collectible  minerals in Dr. Cordua's  suite comprise a significant partial composite of such species,

In a recent email, Dr. Cordua contributed some updated thoughts:.
The similarity in mineralogy at Mountain View and so forth - distinctive stuff like the green sphalerite - I think prove a commonality in origin to the deposits.  Not sure if the formation names haven't changed as a consequence of subsequent remapping. Certainly their interpretation has. I recall plate tectonics just coming in when I was an undergraduate. The Piedmont is certainly a mess of interlocking terranes, likely hacked up now by major faults but, hey, that made for the diverse mineralogy of the state.
None of the literature mentioned thus far provides as much detail as Dr. Cordua's  field notes taken when he collected these specimens.  In addition to species thus far described, they cite manganoan calcite, chalcocite, tenorite (var.) melaconite) covellite, siderite, and celestine.  The notes suggest varying levels of uncertainty regarding  a presence of native sulfur as well as secondary lead minerals  anglesite, cerussite, all known to have been found in microscopic quantities at the nearby Mountain View Lead Mine.

Today, what is left of the Farmers Cooperative Limestone Quarry is filled with water and posted with a no trespassing sign. The remains of an old wooden building still stand, and evidence of trenches and a small foundation are discernible. We saw no evidence of any remaining dumps, especially through the thick midsummer vegetation,

Monday, July 6, 2015

Getting Started in Mineralogy by Gemma Burns

Publisher's note:
Mineral Bliss always been receptive to posts written by guest writers who have something to say that's pertinent.  Gemma Burns, a freelance writer, submitted the first such article that we have received and chosen to publish.  We were impressed as to how she managed to compact the essentials to getting started in our hobby into an article of appropriate for a Mineral Bliss post. 

Mineralogy is a fascinating and rewarding area of interest. Not only is it very good for you in general [1] to have a hobby, but the study of mineralogy can vastly improve your general knowledge and view of the world [2]. However, if you’re just getting started up, it’s easy to make pitfalls, to head in the wrong direction, and to make ill-judged decisions through want of better knowledge. Here, therefore, is a short guide to getting started in mineralogy. There is of course no single surefire route to this, and lots of people get into this in lots of different ways, but these tips might help if you’re a bit uncertain!

A lot of mineralogy can be (and is) learned ‘on the job’ – plenty of people got into mineralogy by finding an interesting rock and experimenting with it. However, if you’re really serious about this science, you’d do well to familiarize yourself with the theoretical basics. There are a wealth of books, magazines, journals [3] and websites out there which can help you to increase your store of rock-based knowledge (including our own website!). If you’re just getting started, it would probably be wise to grab yourself a nuts-and-bolts handbook [4] rather than leaping in at the deep end with the more involved academic stuff.

Once you’ve familiarized yourself with some basic mineralogical theory, it’s time to get down to the real business of learning about rocks on a practical level. A great way of doing this is to get a starter kit which contains samples of rocks all the way up the Mohs Scale of Hardness (well, perhaps not quite all the way up – you’d be hard-pressed to find a kit-maker who’ll put a diamond in a practice kit!). Play around with the samples, learning about what they can and cannot tolerate. Not only will this allow you to get close to the object of your hobby – the rocks themselves – it will also aid your understanding of them on a practical level, and give you some valuable experience which will help you to know how to handle various minerals in the field.

Mineralogy isn’t dangerous if done correctly, but it isn’t always the safest of hobbies either. This is part of what makes it so much fun! Your life as a mineralogist may see you heading for some precipitous rockfaces, or putting yourself in the path of falling rocks. If you’re careful and you know what you’re doing, then you’re unlikely to get into any trouble. But it’s worth brushing up on rock safety procedures and ensuring that you and your kit are ready for all eventualities [5] just in case. Get yourself some steel toe-capped boots, some goggles to protect your eyes when chipping out rocks, a helmet, some tough gloves, a first aid kit, and some hi-viz in order to let workers see you if you’re collecting in a quarry. If you’re really serious about safety, you might also want to grab a Geiger counter in order to monitor the minerals you’re working on. Some rocks can emit surprisingly high levels of radiation [6]!

Apart from safety concerns, you’d also be advised to prepare well for any collecting expedition. Get a good geologists hammer, a chisel, a magnifier, and a bag to put your kit and specimens in. Make sure that you’ve got everything you need before setting out – there’s nothing more irritating than finding a really promising specimen, and being unable to get it out for want of a chisel. It’s also really important to get the permission of any relevant landowner whose land you may wish to work on. Not only will they be able to tell you if you’re likely to be disrupting anything of import with your activities, mineralogists who trespass [7] bring the whole field into disrepute. Finally, you’re advised to obtain things like polish and microscopes to aid you in cleaning up and examining your specimens. Other than that, there’s little else you can do apart from get down to the rockface and learn!

[1] Cynthia Ramnarace, “Why You Need To Have A Hobby”, Business Insider, Mar 2014
[2] R Detrosier, "The benefits of general knowledge; more especially, the sciences of mineralogy, geology, botany, and entomology, being an address delivered at the opening of the Banksian Society, Manchester. On Monday, January 5th, 1829", Hathi Trust
[3] Mineralogical Society Of America, "Select Publications"
[4] Sarah Garlick, “National Geographic Pocket Guide to Rocks and Minerals of North America”, National Geographic
[5] Compare "Looking after your collections"
[6] Thomas Harding, “Museum’s rock collection was highly radioactive”, The Telegraph, Feb 2001

[7] Cornell University Law School, “Trespass”

Sunday, May 31, 2015

The Early History of the Baltimore Mineral Society

Your truly wrote  the article that follows for the October, 2014 edition of the Baltimore Mineral Society's monthly newlsetter, The Conglomerate,  Recently, the Eastern Federation of Mineral and Lapidary Societies awarded it "Trophy" recognition in the "Written Features" category for articles that appeared during 2014 in the monthly newsletters.

                    The Early History of the Baltimore Mineral Society
                                                 by Jake Slagle

Depending upon whom you ask, Baltimore Mineral Society can trace its beginnings to 1950 or 1951.  According to charter member Harold Levey, that is when Paul Desautels, then a professor of chemistry at Maryland State Teachers College (now Towson State University), appeared at the Natural History Society of Maryland to see its mineral collection. At the time, NHSM occupied two buildings in Bolton Hill. One was at 2101 Bolton Street. The other, next door at 2103 Bolton Street, housed its mineral collection.   Although at least one cabinet of minerals adorned a main front room, the building’s kitchen was home to NHSM’s more serious collection, which was well organized in drawers that opened and closed. Additional minerals were packed away in the basement.

Charles Ostrander, after more than a decade of being in charge of NHSM’s minerals, had recently
moved to Harford County.  Mr. Levey (pictured at right), then in his late 20’s, was serving as de facto curator. Mr. Levey recalls that during his visit, Mr. Desautels expressed an interest in arranging for gatherings of people who were interested in minerals where they could talk about them.

Mr. Levey, along with his colleagues at NHSM, the late Ed Geisler, John Glaser, the late Charlie Smith, and Jack Kepper were receptive to the idea. Their initial vision was to form such a group as a separate organization that would be affiliated with NHSM, a proposition that NHSM quickly rejected.  

Mr.Desautels subsequently pitched his idea to the Maryland Academy of Sciences, which then occupied quarters on the third floor of the Enoch Pratt Library.  Soon thereafter, he reappeared at NHSM and stated, “We’re going to be partners.” While no such partnership ever took place, Mr. Desautels was now in contact with enough mineral aficionados in the Baltimore area to assemble the kind of group he envisioned without the support of an outside organization.

The earliest meetings took place at Mr. Desautels’ Towson apartment.  John S. White(pictured at left), who was in high school at the time, recalls being one of the founding officers (Treasurer) along with Mr. Desautels, who was President,   and Mr. Levey, who later became President.  Whether or not the group was yet calling itself the Baltimore Minerals Society is unclear.  Whatever its name, Mr. Levey remembers that in short order, Mr. Desautels was producing  its newsletter with a mimeograph machine at the Teacher’s College.

Mr. Levey, Mr. White, and Mr. Kepper all remember that their meetings were monthly.  The group grew and soon made arrangements to hold its meetings in a classroom and/or in the College’s chemistry lab. Both Mr. Levey and Mr. White recall these early meetings as having been much like classes where Mr. Desautels was the instructor.  Learning about minerals and related fields was not simply encouraged, but required, and assignments were part of the agenda.

Via email, Dr. Jack Kepper, who now lives in Arizona, shared further early recollections pertinent to the Society’s evolution.
Paul Desautels taught us about crystallography, chemistry and was passionate about the preparation of micromounts.  Virtually all of the material initially was from his duplicates, but soon we began collecting on field trips. I recall visiting Phoenixville, Frostburg, and the trap quarries in Virginia.  We even went over as a group to Washington DC to the Washington Mineralogical Society.  I don't think we called ourselves the Baltimore Mineral Society – perhaps our group was just a precursor of the society.
On more than one occasion during those early years, Mr. Desautels arranged for well-known micromounters Neal Yedlin and Lou Perloff to visit in order to provide the group with first-rate access to the micromounting niche of mineral collecting.  After a day of working with micromounts, the entire group retired to the Penn Hotel, then a popular Towson restaurant, for a dinner where the emphasis was on fellowship.

After several such annual gatherings, what had by now become the Baltimore Mineral Society formally held its first annual international micromount symposium in 1956 at the College. Afterwards, the group continued to retire to the Penn Hotel, as the smaller group had done in the past.
The following year, 1957, Mr. Desautels left Maryland State Teachers College to become Curator of Minerals and Gems at the Smithsonian.  Future symposia moved to Stemmers Run Jr. High School in Eastern Baltimore County, where BMS member John Jedlicka was Principal. 

Mr. Desautels remained in his Curator-in-Charge position at the Smithsonian for 25 years. In 1963, he hired Mr. White, then a field geologist working for ASARCO in Tucson, to become a museum technician specializing in mineral sciences. While working at the Smithsonian, Mr. White founded  Mineralogical Record in 1970, and after a series of promotions to various curatorial positions, succeeded Mr. Desautels as Curator-in Charge of the Smithsonian’s Division of Mineralogy in 1984. 

Monday, April 13, 2015

In Middleburg, PA: The Other National Limestone Quarry

Less than ten miles away from the above pictured National Limestone Quarry in Middleburg, Pennsylvania,  is another National Limestone Quarry, which became well known about ten years ago after one of its more remote corners proved to be a source for  world-class wavellite specimens. Owned by the same family, the  Middleburg, PA,, National Limestone Quarry is by all appearances a similar kind of quarry, but it is low on the radar of mineral collectors. In fact, as best as we can determine, even  Mindat is unaware of its existence.

Through prior arrangements with the owner, members of the Baltimore Mineral Society and the Chesapeake Gem and Mineral Society received permission to collect at this "dark limestone" quarry in Middleburg on Saturday, April 11, 2015. We knew it had yielded  fluorite and that "cave flowers" had been found on the berms where  collecting was permitted,

We determined the fluorite to be easy to find in cubes  up to slightly more than an inch.It occurs in veins of dolomite within large boulders of dark limestone. To separate the fluorite cubes from the dolomite encasing them is problematic; likewise to separate the dolomite veins from the limestone through which they intrude. Many of the veins are no more than an inch wide. The preferred method for collecting the fluorite is  to  whack the large boulders with such veins using a large sledge hammer and trim away as much limestone as possible from the resulting particles

A higtlight of the day was an encounter with aragonite rubble  that  clearly originated in a cave that had collapsed on a surrounding wall. Unlike the clear to pale orangish brown aragonite stones present on many of the berms, some of this aragonite demonstrated  a presence of  stalactites, stalagmites, and "cave flowers,"  The seven inch stalactite at right proved to be one of the day's premier finds along with nodular stalagmic sections and some crumbly aragonite with vugs containing impressive microscopic orangish brown aragonite needles. Since nearly all caves or caverns in the region where such material exists are public places that prohibit collecting, this quarry provided a rare such opportunity, although  the picking were slim.

Other finds included magnificent dendrites, pictured at left. Also present, were colorless calcite crystals to about five millimeters  as seen at right  within vugs occurring in a very few limestone boulders. The only other material  of notable  interest to be uncovered were  mud crack rocks.

Even with permission to also collect at the nearby National Limestone Quarry in Mt. Pleasant Mills, the Middleburg locality sufficed to occupy our group for six hours. With  two hours of collecting time remaining, we headed to to the Mt. Pleasant Mills Quarry to a spot that yielded fine barrel-shaped calcite crystals.