7.1" Fluorescent Hexagonal Calcite Crystals - China

This is a gorgeous 7.1 x 6.2" cluster of disk-shaped calcite crystals, collected from Daye County, China. The largest faces of the crystals are milky white, with clear/transparent edges that allow you to look right into the crystals. Under shortwave ultraviolet light, the calcite crystals fluoresces a red-orange color.

The edges and base of the specimen have been cut flat, however it's accompanied with a display stand to assist with preferred presentation.

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.
Calcite & Hematite
Daye County, Huangshi, Hubei, China
7.1 x 6.2"