This Specimen has been sold.
4.9" Orange, Hematite Calcite Crystal Cluster - China
This is a plate of red-orange to clear zoned tetrahedral calcite crystals on a bed of scalenohedral calcite crystals. The rich, red coloration is caused by inclusions of hematite within the calcite. It was collected from the Daye iron mine in China. The entire plate is 4.9x3.9" with the largest crystal measuring 1.9" long. Great quality material. 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.