Ferrosilite

General Information: Chemical Formula:(Fe++,Mg)2Si2O6 Composition:(Molecular Weight = 232.32 gm)Magnesium 10.46 % MgIron 24.04 % FeSilicon 24.18 % SiOxygen 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 grayMore details...