Huge, 12.9" Polished Brown Calcite Egg with Base - Madagascar

This is a piece of brown calcite from Madagascar which has been sculpted into an egg and hand-polished to a high luster. This unique specimen is 12.9" tall and has swirling bands of calcite that vary between tan, white, brown, and orange hues. It is accompanied by a base made from the same material.

Including the base, this colossal specimen weighs just over 42 lbs

This brown calcite was mined from the Norcross-Madagascar brown calcite quarry. This type of calcite likely occurred as a massive conglomerate, formed from mineral rich water solidifying following accumulation as flowstone and/or through precipitative processes.

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. Its fracture is conchoidal, but difficult to obtain.

12.9 x 7.9"