2.3" Orange Calcite Crystal Cluster - Wenshan Mine, China
This is an interesting aggregation of orange calcite crystals. It is part of a new find at the Wenshan zinc mines in the Yunnan Province of China.
Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.
Wenshan Zinc Mine, Wenshan City, Yunnan, China
Entire Specimen: 2.3 x 2.2"