Formula: MnSn(OH)6
Origin of name: for Franz-Erik Wickman (1915-), Swedish mineralogist, who studied the mineralogy of the Langban area.
Crystal system: Cubic/Isometric
Crystal class: 4/m 3 2/m
Twinning:
Unit cell: a = 7.873 Å
Colour: Brownish yellow, orange-brown, yellow-orange, yellow, colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals octahedral
Hardness: 3-4
Specific gravity: 3.89
Cleavage: {100} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments: dimorphous with tetrawickmanite
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