General Information:
Chemical Formula:
(Fe+++,Mg,Al,Fe++,Ti,Mn)2·4(Si1,8Al0,2)O5(OH)4
IMA Status:
Approved IMA
Physical Properties:
Color:
green, green, or dark green.
Density:
2.6
Diaphaniety:
Translucent to Opaque
Hardness:
2.5 - Finger Nail
Luster:
Silky
Streak:
gray green
More details...