Formula: (Co,Fe)As
Origin of name: After locality; Modderfontein, Transvaal, South Africa
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Bluish white
Diaphaneity: Opaque
Luster: Metallic
Habit: Grains, 0.01 - 0.05 mm
Hardness: 4
Specific gravity: 8.28
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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