Appearance: white (Appearance) single square crystallization or amorphous powder, non-toxic, tasteless, stable in the air. Physical properties: lightweight magnesium carbonate slightly soluble in water, can make the water is alkalescent, 15 ℃ in the water solubility of 0.02 g / 100 gH2O, 25 ℃ to 0.025 g / 100 when gH2O, 100 ℃ for 0.5 g / 100 H2O. In the water boil long time, a part of the decomposition for magnesium hydroxide. Soluble in acid, encounter dilute acid decomposition, which released CO2 bubbles. The relative density of 2.16, the coefficient of thermal conductivity of 0.0692 w / (m · k), refractive index of 1.534. Use (Useage) used as a pharmaceutical intermediates, antacids, desiccant, dillenii, carrier, resistance to "fast agent; In food additives, magnesium elements for compensation agent; In fine chemical industry is used in the production of chemical reagents; In rubber reinforcing agent, of filling agent; Can make adiabatic, high temperature resistant fire heat preservation material; Make advanced glass products; Enamel porcelain polished up role; Making magnesium salt, paint, paint, daily cosmetics, shipbuilding, boiler manufacturing. Coating industry used as accessories paint, paint, ink, can increase the stuffing white degree and covering power.