General Information | ||||||||||||||||||
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Chemical Formula |
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Physical Properties of Pyrophyllite | ||||||||||||||||||
Mohs Hardness | 1 to 2Gems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Specific Gravity | 2.65 to 2.90Gems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Tenacity | FlexibleHandbook of mineralogy (2001) , Flexible but inelastic | |||||||||||||||||
Cleavage Quality | PerfectGems, Sixth Edition (2006) , | |||||||||||||||||
Fracture | SplinteryGemstones (2009) , | |||||||||||||||||
Optical Properties of Pyrophyllite | ||||||||||||||||||
Refractive Index | 1.534 to 1.601Gems, Sixth Edition (2006) , RI for the alpha, beta and gamma rays is 1.534–1.556, 1.586–1.589, 1.596–1.601More from other references | |||||||||||||||||
Optical Character | Biaxial/-Gems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Birefringence | 0.050Gems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Pleochroism | NilGemstones (2009) , | |||||||||||||||||
Dispersion | NilGemstones (2009) , More from other references | |||||||||||||||||
Colour | ||||||||||||||||||
Colour (General) | White or pale shades of blue, yellow or greenGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Transparency | Translucent,OpaqueGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Lustre | Pearly,GreasyGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Crystallography of Pyrophyllite | ||||||||||||||||||
Crystal System | Monoclinic,TriclinicGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Habit | Spherulitic aggregates of acicular radiating crystals or foliated laminaeGems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Geological Environment | ||||||||||||||||||
Where found: | Pyrophyllite occurs in hydrothermal veins and in deposits of schistose rocks.Gems, Sixth Edition (2006) , More from other references | |||||||||||||||||
Further Information | ||||||||||||||||||
Mineral information: | Pyrophyllite information at mindat.org | |||||||||||||||||
Significant Gem Localities | ||||||||||||||||||
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