Formula: FeSe2
Origin of name: From ferrous iron (Fe2+) and selenium
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Steel-grey to tin-white with rose or pink tint, tarnishes bronze
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals prismatic, microscopic
Hardness: 6 to 6.5
Specific gravity: 7.21
Cleavage: 1; Perfect parallel to elongation
Tenacity:
Streak: Black
Synonyms/varieties:
Comments: Series with pyrite
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