CALCITE (Calcium Carbonate - CaCO₃)

Calcite is crystallized calcium carbonate with the chemical formula CaCO₃. It can be transparent, white, or yellow in color. Its hardness is 3, and its specific gravity is 2.71. It decomposes with vigorous effervescence in cold, dilute hydrochloric acid. It is abundant in nature. It is generally the main component of carbonate rocks and marble. After being processed in various ways, it is used as a filler in the paint, paper, plastic, and rubber industries.