Formula: Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2
Origin of name: For Olaf Medenbach, German mineralogist
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Yellow, brown-yellow
Diaphaneity:
Luster: Vitreous to adamantine
Habit: Tiny tabular crystals to 0.2 mm forming aggregates
Hardness: 4.5
Specific gravity: 5.90
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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