General Information:
Chemical Formula:
(Mn+++,Al)AlSiO5
Composition:
(Molecular Weight = 183.01 gm)
Manganese 22.51 % Mn
Aluminum 18.43 % Al
Silicon 15.35 % Si
Oxygen 43.71 % O
Empirical Formula:
Mn3+0.75Al1.25SiO5
IMA Status:
Approved IMA 1978
Physical Properties:
Cleavage:
[110] Indistinct
Color:
greenish black.
Density:
3.395
Diaphaniety:
Transparent to Subopaque
Hardness:
6.5 - Pyrite
Luster:
Vitreous (Glassy)
Streak:
gray green
More details...