... 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 ... , the most is muscovite(white mica) ,secondly is phlogopite, Use 1. the superfine mica powder is the fuctional filler of ...