General Information:
Chemical Formula:
Fe++Fe+++2(SiO4)2
Composition:
(Molecular Weight = 351.71 gm)
Iron 47.64 % Fe
Silicon 15.97 % Si
Oxygen 36.39 % O
Empirical Formula:
Fe2+Fe3+2(SiO4)2
IMA Status:
Approved IMA 1976
Physical Properties:
Cleavage:
[001] Good, [100] Perfect, [010] Perfect
Color:
dark brown or black.
Density:
3.92
Diaphaniety:
Opaque
Hardness:
6 - Orthoclase
Luster:
Sub Metallic
Streak:
light brown
More details...