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Dominant species
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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.
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