Lot: Polished Blue Calcite Pebbles - 5 kg (11 lbs)

These are polished Blue Calcite "Pebble" or Palm Stone. Each one is about 2-3" wide and fits nicely into the palm of your hand, hence the name. Calcite is a very common and widespread mineral with highly variable forms and colors. This is a wholesale lot of 5 kg (11 lbs) of high quality, polished blue calcite pebbles from Madagascar.

This blue calcite was mined from the Norcross-Madagascar blue calcite fields. 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.

Blue Calcite
Pieces 2-3" wide, 5 kg (11 lbs total)