Formula: PbFeGe3O8
Origin of name: For Wolfgang Bartelke, Namibian amateur mineralogist
Crystal system: Monoclinic
Crystal class: 2 or 2/m
Twinning:
Unit cell:
Colour: Colourless to pale greenish
Diaphaneity:
Luster:
Habit: Crystals tabular or acicular, microscopic
Hardness: 4
Specific gravity: 4.97
Cleavage: 1; {101} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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