Linnaeite
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Linnaeite is a cobalt sulfide mineral with the composition Co⁺²Co⁺³₂S₄. It was discovered in 1845 in Västmanland, Sweden, and was named to honor Carl Linnaeus.
Linnaeite forms a series with polydymite, Ni⁺²Ni⁺³₂S₄. Wikipedia
Color: Steel gray to gray violet
Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
Crystal habit: As octahedral crystals; massive, granular
Crystal system: Cubic
Formula (repeating unit): Co+2Co+32S4
Space group: Fd3m
Streak: Grayish-black
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