Physical properties of Calcium Carbonate
Calcium Carbonate is an inorganic compound with the chemical formula CaCO₃, which is the main component of limestone, marble, etc. Calcium Carbonate is basically insoluble in water, soluble in hydrochloric acid (reacts with hydrochloric acid). It is one of the common substances on earth and exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of some animal bones or shells. Calcium Carbonate is also an important building material with a wide range of industrial uses.
Calcium Carbonate is a white fine crystalline powder, tasteless and odorless. There are two forms, amorphous and crystalline. The crystal form can be divided into orthorhombic system and hexagonal crystal system (anhydrous Calcium Carbonate is colorless orthorhombic crystal, hexahydrate Calcium Carbonate is colorless monoclinic crystal), which is columnar or rhombus, with a density of 2.93g/cm3 . The melting point is 1339°C (decomposed at 825-896.6°C), and the melting point is 1289°C at 10.7MPa. Insoluble in alcohol, soluble in ammonium chloride solution, almost insoluble in water.