Cuprotungstite Xls on Scheelite
Thumbnail, 2.0 x 1.8 x 1.6 cm
Gold Hill District (Clifton District), Deep Creek Mts, Tooele Co., Utah, USA
Ex. Philadelphia Academy of Natural Sciences; William Vaux
SHARP, definite crystals to 3 mm of the rare species Cuprotungstite are here perched atop an altering scheelite crystal (that is itself now partially Cuprotungstite), on this amazing rare species piece from a very old US locality. Not much to look at, except dark green micros on a brown octo, but a very significant little treasure nonetheless. Sold by Cahn around WWI, judging by the address on his label.