General Information:
Chemical Formula:
(Fe++,Mg)2Si2O6
Composition:
(Molecular Weight = 232.32 gm)
Magnesium 10.46 % Mg
Iron 24.04 % Fe
Silicon 24.18 % Si
Oxygen 41.32 % O
Empirical Formula:
Fe2+MgSi2O6
Environment:
Found in basic and ultrabasic igneous rocks.
IMA Status:
Approved IMA
Locality:
Unspecified locality in Russia.
Name Origin:
Named for its composition (Ferrous Silicate).
Physical Properties:
Cleavage:
[210] Good, [100] Parting
Color:
colorless, green, dark brown, or nearly black.
Density:
3.88 - 4.02, Average = 3.95
Diaphaniety:
Translucent to Opaque
Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, ,
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
Streak:
pale brownish gray
More details...