hebei jiali trade co., ltd. can suply good qulity of mica. mica falls into three kinds:biotite,muscovite,phlogopite. the biotite is black or puce, and some with the color of pink, aqua or other tone. the slice of biotite is flexible, of which the hardness is 2-3, and the specific gravity is 3.02-3.12. the color of biotite is yellow, brown or green under the microscope transmission. the phlogopites fall in two major kinds: the deep phlogopite (various deepness of brown and green) and light mica (various deepness of light golden). muscovitethe powder of muscovite is widely used in many fields such as: welding rod, coating materials, pipe mortar, adhesive material, plastics, felt, paper making, oil field, making hole, decoration, cosmetic and so on.