- Baumstarkite, Miargyrite
- San Genaro Mine, Castrovirreyna District, Castrovirreyna Province, Huancavelica Department, Peru
- Miniature, 3.4 x 2.7 x 1.5 cm
This piece consists of rounded crystal-aggregates up to an amazing 1 cm in size. The flattened platy crystals are Baumstarkite, a dimorph of miargyrite. The deep charcoal color and metallic luster are very good. The matrix is a mixture of Baumstarkite and Miargyrite. Ex. Charlie Key.