Calcium carbonate is a white fine crystalline powder, tasteless and odorless. There are two forms, amorphous and crystalline. Crystal type can be divided into rhombic and hexagonal crystal systems (anhydrous calcium carbonate is a colorless rhombic crystal, hexahedrons calcium carbonate is a colorless monoclinic crystal), is columnar or rhomboid, the density of 2.93g/cm3. The melting point is 1339 (decomposed at 825-896.6) and 1289 at 10.7MPa. Insoluble in alcohol, soluble in ammonium chloride solution, and almost insoluble in water. Recently, a customer in Kazakhstan, who operates a factory producing door and window profiles, purchased light calcium carbonate from us. Product name: Calcium carbonate Specification: 325mesh,800mesh,1250mesh,2000mesh Form: Powder Color: White CAS NO.:471-34-1 Calcium carbonate Packing and shipping: 25kgs/bag, 1 ton/ton bag, or as required. Usage: Used in papermaking, metallurgy, glassalkali, rubber, medicine, pigment, organic chemical industry. Calcium carbonate Storage: Storage in a ventilated low-temperature dry warehouse. Ports of delivery are Tianjin, Qingdao, and Dalian port.