It is the common material, exists in aragonite, calcite, chalk, limestone, marble, lime China in the rock, etc. Also for animal bones or housing the main ingredients.

Verification and measuring the reaction of organic compounds halogen. Water analysis. Verification p. Together with ammonium chloride decomposition of Portland. Calcium chloride solution preparation with standardized soap. Manufacturing optical glass raw materials, nd coating raw materials. The food industry can be used as additive.