Soap stone powder (talc) can be provided by our plant ore mine of ourselves whiteness:88%min SiO2: 59%min MgO: 31MAX Soap stone powder (talc)can be provided by our plant.size :325-5000meshwhiteness: 88-99.9%LOI: 7-18%packing: 25kg bag, 1 ton bag.if you have inerest in this product, please send me email with specification is better, many thanks soap stone powder( talc)