High quality mgco3 powder, used as food additive, pH regulating agent or supplement of magnesium element in food.... Physicochemical Properties: White amorphous powder, nontoxic ... . And it also can be used to manufacture high-grade glass articles, magnesium salt, pigment, paint and chemicals for daily use, etc ... , etc. Processing Method:Brine, Soda Method, Ammonium Bicarbonate Method MgCO3, Food Grade