General Information:
Chemical Formula:
KCa(Mn,Fe++,Zn)21(Si,Al)32O76(OH)16·12(H2O)
IMA Status:
Approved IMA 1968
Physical Properties:
Cleavage:
[001] Perfect
Color:
dark brown or black.
Density:
2.83
Diaphaniety:
Translucent
Hardness:
4 - Fluorite
More details...