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Greigite

Year of discovery: 1964 (Kramer Junction, USA), 1950 (Japan)

Locality list: 5 localities of greigite

• Fe₃S₄
• [Fe²⁺][Fe³⁺₂][S₄]^8-

• Class: Linnaeite subgroup < Thiospinel group < Spinel supergroup
• Class: Sulfide
• Magnetism: Ferrimagnetic

• Fe²⁺ => Co: Linnaeite
• Fe²⁺ => Ni: Polydymite
• Fe²⁺ => Rh: Kingstonite

• Fe³⁺ => Ni: Violarite (Series)
• Fe³⁺ => Cr: Daubréelite (Daubreelite)
• Fe³⁺ => In: Indite
• Fe³⁺ => Rh: Ferrorhodsite

• S => O: Magnetite

• Color: Pink
• Tarnish: Blue
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedra, Cubic
• Aggregate: Ball of intergrown octahedron

• Hardness: 4-4.5
• Density: 4.0

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=9.9

Etymology: Dr. Joseph Wilson Greig (1895-1977), American mineralogist