Balangeroite

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...