5.8" Polished Orange Calcite Sphere - Mexico
This is a piece of orange calcite from Mexico. It's 5.8" wide and has multiple layers of calcite that vary between white and orange hues. It has been polished into a sphere with a flawless glossy finish. Comes with an acrylic ring 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.