Formula: (Fe,Ni)(Sb,As)2
Origin of name: after locality Seinäjoki deposit, central Finland
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: light gray with rose tint in reflected light, pinkish tint
Diaphaneity: opaque
Luster: metallic
Habit: massive
Hardness:
Specific gravity: 7.94
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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