Otjisumeite

General Information:
 Chemical Formula:
PbGe4O9
 Composition:
(Molecular Weight = 641.63 gm)
Germanium 45.27 % Ge
Lead 32.29 % Pb
Oxygen 22.44 % O 
 Empirical Formula:
PbGe4O9
 Environment:
With other Ge-bearing minerals.
 IMA Status:
Approved IMA
 Locality:
Tsumeb mine, Namibia.
 Name Origin:
Named for the Herrero tribe name of the locality, Tsumeb.
Physical Properties:
 Cleavage:
[???] Indistinct
 Color:
colorless or white.
 Diaphaniety:
Translucent
 Habits:
Pseudo Hexagonal - Crystals show a hexagonal outline., ,
 Hardness:
3 - Calcite
 Luster:
Subadamantine
 Streak:
white
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