Joesmithite

General Information:
 Chemical Formula:
PbCa2(Mg,Fe++,Fe+++)5Si6Be2O22(OH)2
 IMA Status:
Approved IMA 1968
Physical Properties:
 Cleavage:
[110] Perfect
 Color:
black.
 Density:
3.83
 Diaphaniety:
Transparent to Translucent
 Hardness:
5.5 - Knife Blade
 Luster:
Vitreous (Glassy)
 Streak:
light brown
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