biotite and mica powder
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Biotite is black, fuscous brown, and sometimes with a little light red, green, or other tint. Transparent to semitransparent, with vitreous luster or metallic luster. Hardness: 2-3, density: 3.02-3.12g/cm3, they are usually used in construction padding.
2. Mica powder:
Mica powder are extensively used in many industries such as mica ceramic materials, plastic, rubber, construction materials, paint padding, drilling fluid additives, paper, cosmetic and so on.