General Information:
Chemical Formula:
(Mg,Fe++)7Si8O22(OH)2
Composition:
(Molecular Weight = 836.02 gm)
Magnesium 15.26 % Mg
Iron 11.69 % Fe
Silicon 26.88 % Si
Hydrogen 0.24 % H
Oxygen 45.93 % O
Empirical Formula:
Mg5.25Fe2+1.75Si8O22(OH)2
Physical Properties:
Cleavage:
[110] Good
Color:
brown, gray green, white, light gray, or dark green.
Density:
3.13
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Silky
Streak:
white
More details...