Formula: (Fe,Mn)WO4
Origin of name: from German Wolf = wolf and Rahm is soot, German name for tungsten
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: common on {100}, usually contact, also on {023}, penetration
Unit cell: a = 4.78 Å, b = 5.73 Å, c = 4.98 Å, b = 90.6°
Colour: Brownish black, Iron black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Prismatic, lamellar, massive, granular
Hardness: 4.5
Specific gravity: 7.1 - 7.5
Cleavage: {010} perfect
Tenacity: Brittle
Streak: Reddish brown
Synonyms/varieties: isowolframite
Comments: intermediate member of the series hübnerite-ferberite
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