General Information:
Chemical Formula:
(Mg,Fe+++,Fe++,Mn++)42Si16O54(OH)40
IMA Status:
Approved IMA 1983
Physical Properties:
Cleavage:
[???] Perfect
Color:
brownish yellow or dark brown.
Density:
2.98
Luster:
Vitreous - Greasy
Streak:
brownish white
More details...