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. |