This Specimen has been sold.
2.5" Dogtooth Calcite Crystal Cluster - Morocco
This is a dogtooth calcite crystal cluster collected from Morocco. This crystal is 2.5" wide and has a brown-yellow coloration. There is damage to the terminations of the crystals.
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.