Calcite

Around 2006 the now reknown Yaogangxian Mine poduced these prismatic crystals with trigonal terminations. Many came out as singles, but I liked the composition of this cluster. The main crystal is doubly terminated and the only cleaved crystals are the one protruding to the left of the upright view, as they likely intersected other crystals.

Locality: Yaogangxian Mine, Hunan Province, China

Composition: calcium carbonate