Monthly Archives September 2008

The versatile calcite

Calcite (CaCo3) is a highly versatile crystal that comes in many types of colors and crystallized forms. It is too soft to be actually used as jewelry for the long term, having only a hardness of 3 on the Mohs scale. Its color ranges from colorless to orange, red, blue, green, down to black. Calcite is common, and occurs worldwide. It is found as masses, microcrystalline crystals, concretions, fibrous, and singular crystals (scalenohedrons and rhombohedrons). It is also soluble in hydrochloric acid, and can be burned in high flame, breaking down into carbon dioxide and lime in the process. Some
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