Pyrophyllite

Name:
Pyrophyllite
Detailed information:

M Formula:	Al2Si4O10(OH)
Properties:
White, green, gray, brown color; pearly to greasy luster, good micaceous cleavage. D 2.8–2.9, Mohs hardness 1–2. Similar to talc.
Occurrence:
North Carolina, California, Newfoundland, Japan.
Use:
Ceramics, insecticides, slate pencils, substitute for talc, extender in paints, wallboard, buffer in high-pressure equipment, permissible animal feed additive.