Formula: FeFe2S4
Origin of name: For Joseph Greig, American petrologist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 9.87 Ǻ
Colour: Pink, tarnishes metallic blue
Diaphaneity:
Luster: Metallic
Habit: Intergrown octahedra with curved faces, in groups forming balls; cubes; tiny grains
Hardness: 4 to 4.5
Specific gravity: 4.05
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties: Melnikovite
Comments: Strongly magnetic
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