Glittering Stones >> Semi Precious Stones >> Calcite

Semi Precious Stone Calcite

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The other polymorphs in calcite are the minerals aragonite and vaterite. The aragonite will change to calcite at 470°C, and vaterite is even less stable.

Calcite seas existed in Earth history when the primary inorganic precipitate of calcium carbonate in marine waters was low-magnesium calcite that opposed to the aragonite and high-magnesium calcite precipitated.

The mineral Calcite primarily often constituent of the shells of marine organisms, e.g., plankton (such as coccoliths and planktic foraminifera), the hard parts of red algae, some sponges, brachiopoda, echinoderms, most bryozoa, and parts of the shells of some bivalves, such as oysters and rudists).

Historical Facts of Ammolite Refractive Index 1.640 - 1.660, 1.486 Chemical Composition CaCO3 Hardness 3 Density 2.71 Crystal Group Trigonal Hexagonal Scalenohedral Luster Vitreous Occurrence New Mexico Color Colorless, White, Gray, Yellow, Green, Pink

Gem Jewelry Bloodstone

Calcite Bracelet

Calcite Earrings

Calcite Necklace

Calcite Ring