Dims: 1.3x0.6x0.6" (3.4x1.6x1.5cm)
Wt: 0.43 oz. (12.3g)
Veshnovorgorsk, Chelyabinsk Oblast, Russia
This thumbnail has one large, nearly complete octahedral crystal of pyrochlore, along with several visible fragments of additional octahedrons, on a host rock of calcite and biotite. This specimen is only slightly radioactive, barely above background levels. The brownish-orange crystals are translucent and have many internal fractures which reflect orange highlights when the light hits them. The luster is vitreous, although the crystal surface is rather uneven (looking a lot like the surface of mica crystals).