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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