General Information: Chemical Formula:(Mg,Fe++,Ca)(Mg,Fe++)Si2O6
Composition:(Molecular Weight = 219.70 gm)
Calcium 1.82 %
CaMagnesium 14.93 %
MgIron 13.98 %
FeSilicon 25.57 %
SiOxygen 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
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