This Specimen has been sold.
4.6" Yellow Calcite Crystal Cluster - Pakistan
This is a calcite crystal cluster that was collected from the Loralai District of Balochistan, Pakistan. Under long wave UV, it fluoresces a very faint orange in color. there are small amounts of fluorite along the edges of this cluster which fluoresce purple in color.
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.