Formula: (Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23
Origin of name: From Greek for blood
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: Brownish red to almost black
Diaphaneity: Translucent to nearly opaque
Luster: Vitreous, pearly to submetallic on cleavage
Habit: Crystals thick tabular or rhombohedral, rhombohedral faced striated horizontally
Hardness: 3.5
Specific gravity: 3.49
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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