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Pyrophyllite

#GJ34805

Pyrophyllite

#GJ34805
Availability
Sold
Size
9 x 7 x 4 cm - Sm Cabinet 
Formula
Al2Si4O10(OH)2 (RRUFF)
Locality
Indian Gulch, Mariposa Co., California, United States

Phyllosilicate - Monoclinic - not a Mica group member but is a member of the Talc series. Talc is found as tabular crystals {001}. foliated and stellate masses, inelastic laminae, less abundant than Talc. Forms from the alteration of Feldspars, in Al-rich rocks, under acidic conditions >300 d C...below which Kaolinite forms.

Pyrophyllite

Formula
Al2Si4O10(OH)2 
Crystal System
Triclinic 
Crystal Habit
Earthy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brown green, brownish yellow, greenish, gray green, gray white 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Flexible 
Hardness
1.5-2 

Data courtesy of Webmineral.

Collection
Jungles Collection

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