Gems Library
Precious stones
Semi Precious Stones
Gems Jewelry
Gems and Uses
Gems gallery
Crystal
Choose Gems For U
Gemstones & Birthstones

 

 

 

 

    Home   History   Gem type   Gem uses   About Us   Contact us

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).

Calcite

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 Bracelet

Calcite Earrings

Calcite Earrings

Calcite Necklace

Calcite Necklace

Calcite Ring

Calcite Ring

 
    Properties   Glossary   links   Sitemap  
 

Glittering stones - Precious stones - Semi precious stones - Gem Jewelry - Gem stone glossary - History of gems - Aboutus - Gems Library - Gem Gallery - Contact Us - Types of gem - Gemstones Uses - Precious Stones Properties - Gemstones & Birthstones - Heart of matter - Gem Jewelry Links - Glittering Stones News - Gem Stone Articles - Semi Precious Stones Sitemap

Halloween costumes - Halloween men costumes - Dermalogica - Search Engine Optimization