Deaccessions from the Philadelphia Academy of Sciences

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PAS-173 - Narsarsukite - SOLD
Whitlash, Liberty Co., Montana, USA
small cabinet, 5.6 x 5.4 x 5.1 cm

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An interesting locality reference specimen of massive embedded bits in matrix, of this rare species.

PAS-174 - Tinticite - SOLD
Unnamed cave near the mine, Tintic Standard Mine, East Tintic Mts, Utah Co., Utah (TYPE LOCALITY)
cabinet, 12.9 x 8.4 x 7.2 cm

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Tinticite is an extremely rare iron phosphate, found in only a few spots. Although microcrystalline here, the covering on the matirx is very rich and there is probably more inside - I should probably break it into 50 specimens to sell for thumbnail reference samples to the rarities colelctors, in fact. However, we'll leave it together first (though i think more money can be made by trimming and selling/trading off bits).

PAS-178 - Chalcanthite with COPPER replacing Wood - SOLD
Rambler Mine, New Rambler District, Albany Co., Wyoming, USA
large cabinet, 22.7 x 13.4 x 11.4 cm

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The Rambler mine was in its heyday by 1900 or so, and continued for a number of years afterwards to dominate copper production in this region. This particular specimen is the only Chalcanthite of any kind that I have personally seen from the state (and this is the only listed locality likely to have produced such a piece, although the label accompanying just says "chalcanthite - wyoming - natural"). The specimen carries an old label from dealer Gary Hansen. Could it be formed from mine run-off? It DOES have the look of deposition from flowing solution, but this could have formed naturally, as the label says, during flow of water through the mine, completely unrelated to human mining. As with another musuem chalcanthite of large size in this collection, I am disinclined to think these to be manmade fakes - something I would be very suspicious of today from contemporary mining locations. So, which is it? The giveaway is the presence of COPPER-REPLACED wood, embedded in the chalcanthite at the bottom and rear of the specimen. No kidding, if you knock on it with a key or finger, the slender wood timber clinks like metal. The replacement is not 100% complete, as the wood is still somewhat malleable/bendable, but it is far enough along that you can say the copper has replaced much of the wood. So , we have a naturally formed example of chalcanthite, not made on a lab table - but formed postmining from the runoff of the copper-laden waters running over old mine timbers. In any case, it is a huge, beautiful, breathtakingly colorful display specimen!

PAS-185 - Variscite - SOLD
Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia
cabinet, 13.8 x 6.5 x 6.4 cm

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Unusual, sparkling, hemispherical variscite aggregates to 3mm crowded on an ore matrix. Quite unusual compared to the few examples of variscite I have seen from here in modern times.

PAS-150 - Bismuth - SOLD
Siglo Veinte Mine, Llallagua, Bustillos Province, Potos� Department, Bolivia
cabinet, 12.6 x 9.3 x 4.5 cm

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This important large, museum-sized specimen has lustrous, brilliantly metallic bismuth crystals exposed in massive ore matrix. The crystals reach 3 cm in size! The left half of the specimen is also crystallized around on the backside as well. This is a major Bolivian native bismuth specimen, I think.

PAS-136 - Stibnite - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
small cabinet, 6.8 x 6.0 x 4.5 cm

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Stibnite is quite a rare species from this mine, and this is a solid specimen with a large display face of embeeded crystals and crystal fragments. It was collected in the 4th Vaux-funded expedition of 1929-1930

PAS-137 - Silver on ore - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
small cabinet, 8.7 x 6.2 x 2.5 cm

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For some reason, despite a wealth of silver inore, actual native silver is rare here and specimens from the old workings even more so. This piece has visivle silver upon the surface. From the William Vaux collection, donated to the Academy.

PAS-138 - Cassiterite - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
miniature, 3.9 x 3.0 x 2.8 cm

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Just a cute, sparkling cassiterite from the famous 4th Vaux expedition trip, with a neat label to attest

PAS-140 - Limonite - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
miniature, 5.4 x 1.3 x 1.2 cm

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Just a cute, interesting specimen from the famous 4th Vaux expedition trip, with a neat label to attest. the tube is hollow and you can see through the pinhole in the middle.

PAS-141 - Pyrite - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
small cabinet, 7.3 x 4.4 x 3.6 cm

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A strange pyrite specimen (which in this rich form is rare for here), with a single crystal of sphalerite(?) perched atop.

PAS-142 - Monazite-(Ce) - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
cabinet, 10.4 x 6.2 x 3.9 cm

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Apparently this piece was a big deal at the time, obviously studied to determine its elemental content. However, I THINK the monzaite here is only massive or at best micros

PAS-143 - Tetrahedrite on Quartz - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
miniature, 4.5 x 3.5 x 3.1 cm

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A rare tetrahedrite from this locality. Sharp crystals to 6mm in massive, hefty cluster upon quartz

PAS-144 - unknown Llallagua samples - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
miniature, 4.5 x 3.5 x 3.1 cm

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Sorry, we have no images of this specimen at present.

PAS-145 - Muscovite ps. after Orthoclase - SOLD
Llallagua, La Joya district, Cercado Province, Oruro Department, Bolivia
cabinet, 9.9 x 5.0 x 4.3 cm

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A single crystal of orthoclase has been pseudomorphed to muscovite, according to this label from the 4th Vaux expedition in 1929-1930. .

PAS-151 - Searlesite - SOLD
Westvaco mine, Green River formation, Sweetwater Co., Wyoming, USA
cabinet, 11.3 x 7.2 x 1.8 cm

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This is a HUGE crystal for the species, showing an 8 cm-tall subtermination leading up to the main termination above. These are giants for the species and it is an attractive specimen from a state which frnaky doesn't give us a lot fo great mineral species. It is coated in some edges by another white, powdery mineral species (perhaps norsethite but not yet tested).

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Rob Lavinsky, rob@irocks.com

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