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
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