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Locality: Tazna Mine (Tasna Mine; Tazna-Rosario Mine), Cerro Tazna, Atocha-Quechisla District, Nor Chichas Province, Potosí Department, Bolivia (Locality at mindat.org)
Size: 4.8 x 4.0 x 3.6 cm.
A supremely sharp, jet-black, metallic twinned crystal of ferberite from perhaps the best locality for the species in its twinned habit. This crystal is 3-dimensional, sharp, and really beautiful for a "black ugly." It is almost pristine, with just a few really insignificant dings and otherwise compete all around. It was one of the finest pieces, certainly among the best few miniatures, in a small pocket recovered in about 2004-2005 and sold by the dealership of Bolivian mineral specialist, Brian Kosnar.
Ex Dr Wouter Van Tichelen collection (Belgique).
Acquis en 2017.
Colección : Curiosités minérales