This Specimen has been sold.
4.8" Calcite Crystal Cluster with Green Fluorite - China
This is a unique formation of yellow calcite crystals that contain a milky grey zone/inclusion. It comes with an acrylic display stand to assist with presentation. Under short wave UV, the calcite fluoresces a faint pinkish-orange color. Comes with an acrylic display stand.
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.