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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