Bartelkeite

General Information:
 Chemical Formula:
PbFe++Ge3O8
 Composition:
(Molecular Weight = 608.87 gm)
Iron 9.17 % Fe
Germanium 35.78 % Ge
Lead 34.03 % Pb
Oxygen 21.02 % O 
 Empirical Formula:
PbFe2+Ge3O8
 Environment:
Primary ore cavities with other Ge-bearing minerals.
 IMA Status:
Approved IMA 1979
 Locality:
Tsumeb, Namibia.
 Name Origin:
Named for Wolfgang Bartelke, mineral collector and specialist in Tsumeb mineral.
Physical Properties:
 Cleavage:
[101] Distinct
 Color:
colorless or light green.
 Density:
4.97
 Diaphaniety:
Transparent
 Habits:
Tabular - Form dimensions are thin in one direction., Acicular - Occurs as needle-like crystals.,
 Hardness:
4 - Fluorite
 Streak:
white
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