Pyrophyllite
Chemical Formula	Al2Si4O10(OH)2
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	1-2
Specific Gravity	2.65-2.9
Color	Brown green, brownish yellow, greenish, gray green, gray white
Streak	white
Luster	Pearly, Dull
Refractive Index	n = 1.534 - 1.556 n = 1.586 - 1.589 n = 1.596 - 1.601
Diaphaneity	Translucent, Opaque
Cleavage	Perfecton
Crystal Habit：Compact spherulitic aggregates of needlelike radiating crystals; asfine grained foliated laminae, granular, massive
Geological Setting：Hydrothermal veins and in bedded deposits in schistose rocks.