1.Molecular Formula: H2Mg3O12Si4 2.Size: 200-5000mesh 3.Appearance:black powder 4.Whiteness:78% to 92% 5.25kg packing Talc ... shining, good adsorptivity. It can be used in industries of food, rubber, painting, ceramics, cosmetic, pharmaceutical, paper-making, etc. Composition cotent ...