size: 250-300mesh 800mesh 1250mesh hardness:3 shape:grain powder color:white and black Used in rubber plastic cable paint Use:Used in made cement, ceramic, lime, CO2,chalk, artificial stone, and can be used as pigment, filler, mixture medium, rub agent, sugar clarifying agent; also it can be used as filler of rubberplastic; as feed additives, vector of veterinary drugs.In medicine, it can be used ...