Calcite

A wonderful assemblace of curved  lenticulated rhombohedra with a slight sulfide overtone. This old German mining area produced Silver and Uranium as well as other mineral species, including native Bismuth and Skutterudite. Slightly reactive (orange) to LW indicating some minor manganese content. Ex Steven Gerome

Locality: Bad Schlema, Schlema-  Hartenstein District, Erzgebirge, Saxony, Germany

Composition: calcium carbonate