Locality: Uranium Mine No. 21, Háje, Príbram, Central Bohemia Region, Czech Republic
Size: 15 mm x 12 mm x 7 mm (0.6 in. x 0.4 in. x 0.3 in.)
Weight: 1.8 g (0.06 oz.)
Thumbnail specimen of the rare mineral montroseite with lustrous black acicular clusters to 1 mm. Best appreciated under magnification. Ex. R. Vano.