Formula: Mn(Fe, Mn)2O4
Origin of name: From locality; Gozaisho mine, Iwaki, Fukushima Prefecture, Japan
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 8.519, c = 8.54
Colour: Greenish black
Diaphaneity: Opaque
Luster: Metallic
Habit: Anhedral grains, aggregates
Hardness: 6 to 6.5
Specific gravity: 4.85
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties: alpha vrendenbergite,
vrendenbergite alpha
Comments: Dimorphous with jacobsite, strongly magnetic
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