General Information:
Chemical Formula:
Fe+++2Si4O10(OH)2
Composition:
(Molecular Weight = 418.04 gm)
Iron 26.72 % Fe
Silicon 26.87 % Si
Hydrogen 0.48 % H
Oxygen 45.93 % O
Empirical Formula:
Fe3+2Si4(OH)2O10
IMA Status:
Approved IMA 1979
Physical Properties:
Cleavage:
[001] Perfect
Color:
brownish yellow.
Density:
2.6 - 3, Average = 2.8
Diaphaniety:
Transparent to Translucent
Hardness:
1-2 - Between Talc and Gypsum
Luster:
Pearly
Streak:
light yellow
More details...