General Information:
Chemical Formula:
(Fe++,Mn)7[Si7O21]
Composition:
(Molecular Weight = 1,512.40 gm)
Manganese 3.63 % Mn
Iron 22.16 % Fe
Silicon 52.00 % Si
Oxygen 22.22 % O
Empirical Formula:
Fe2+6Mn2+4(Si7)O21
Environment:
Gabbroic rocks. Forms a series with pyroxmangite.
IMA Status:
Approved IMA 1970
Locality:
Sea of Tranquility, Moon and Isanago mine, Kyoto Prefecture, Japan.
Name Origin:
Named after its resemblance to the pyroxenes and containing iron over manganese..
Physical Properties:
Cleavage:
[110] Perfect, [010] Poor, [001] Poor
Color:
colorless, yellow, orange, or pink orange.
Density:
3.68 - 3.76, Average = 3.72
Diaphaniety:
Transparent to Translucent
Hardness:
4.5-5.5
Luster:
Vitreous (Glassy)
Streak:
white
More details...