... rubber, plastics, wire ,cable and so on. Mica Powder Fineness of Mica powder :800 mesh ,1500mesh ,3000 mesh .Mica mostly crystallize ... into monoclinic system ,crystal appear as fake hexagonal sheet, flake, ... clintheriform,sometimes as fake hexagonal prism.hardness 2-3 ,specific gravity 2.70-3.20. mica powder have special ...