Formula: FeFe3As5O13
Origin of name: for Hans Schneiderhöhn, German mineralogist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell: a = 8.962 Å, b = 10.07 Å, c = 9.194 Å, a = 63.06°, b = 116.2°, g = 81.71°
Colour: dark brown, nearly black
Diaphaneity: opaque
Luster: metallic to adamantine
Habit: druses of crystal aggregates to 7 mm
Hardness: 3
Specific gravity: 4.3
Cleavage: 3; {100} perfect, two distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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