General Information:
Chemical Formula:PbFe++Ge3O8
Composition:(Molecular Weight = 608.87 gm)Iron 9.17 %
FeGermanium 35.78 %
GeLead 34.03 %
PbOxygen 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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