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Linnaeite

Year of discovery: 1845 (Bastnäs mines, Sweden), 1940 (Japan)

Locality list: 8 localities of linnaeite

• Co₃S₄
• [Co²⁺][Co³⁺₂][S₄]^8-

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

• Co => Ni: Polydymite (Series)
• Co => Fe: Greigite
• Co => Rh: Kingstonite

• Co²⁺ => Cu: Carrollite

• Co³⁺ => Ni: Siegenite

• S => Se: Bornhardtite

• Color: Gray
• Tarnish: Reddish brown-Purple
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedral
• Twin: {111}

• Cleavage: {100} Imperfect (3 planes)
• Hardness: 4.5-5.5
• Density: 4.5

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=9.4

Etymology: Carolus Linnaeus (1707-1778), Swedish taxonomist