Formula: BaMn2FeOSi2O7(OH)
Origin of name: from orthorhombic and ericssonite
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: brownish black, reddish black
Diaphaneity:
Luster: submetallic to pearly on cleavage
Habit: massive, embedded plates to 2 cm
Hardness: 4.5
Specific gravity: 4.21
Cleavage: 2; {100} perfect, {011} distinct
Tenacity:
Streak: brown
Synonyms/varieties:
Comments: dimorphous with ericssonite
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