General Information:
Chemical Formula:
(Mg,Fe++,Ca)(Mg,Fe++)Si2O6
Composition:
(Molecular Weight = 219.70 gm)
Calcium 1.82 % Ca
Magnesium 14.93 % Mg
Iron 13.98 % Fe
Silicon 25.57 % Si
Oxygen 43.69 % O
Empirical Formula:
Mg1.35Fe2+0.55Ca0.1Si2O6
IMA Status:
Approved IMA 1987
Physical Properties:
Cleavage:
[110] Good
Color:
brown, greenish brown, light purple brown, or black.
Density:
3.3 - 3.46, Average = 3.38
Diaphaniety:
Translucent to Subopaque
Hardness:
6 - Orthoclase
Luster:
Vitreous - Dull
Streak:
gray white
More details...