Formula: Pb2(Mn,Fe)(VO4)2 . H2O
Origin of name: For L. Brackebusch, Argentine mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark brown to black
Diaphaneity: Translucent to nearly opaque
Luster: Submetallic
Habit: Crystals acicular, striated, in tufts and groups; botryoidal or dendritic
Hardness:
Specific gravity: 6.05
Cleavage: None
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments:
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