Linnaeite

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 (1707–1778).[1]

Linnaeite
Linnaeite samples and polished section
General
CategorySulfide mineral
Thiospinel group
Spinel structural group
Formula
(repeating unit)
Co+2Co+32S4
Strunz classification2.DA.05
Crystal systemCubic
Crystal classHexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space groupFd3m
Unit cella = 9.43 Å; Z = 8
Identification
ColorSteel gray to gray violet
Crystal habitAs octahedral crystals; massive, granular
TwinningOn {111}
CleavageImperfect on {001}
FractureSubconchoidal
Mohs scale hardness4.5-5.5
LusterMetallic
StreakGrayish-black
DiaphaneityOpaque
Specific gravity4.8-5.8
Alters toTarnishes in air
References[1][2][3]

Linnaeite forms a series with polydymite, Ni+2Ni+32S4.[4] Linnaeite is found in hydrothermal veins with other cobalt and nickel sulfides in many localities around the world.[3]

References

  • Schumann, Walter (1991). Mineralien aus aller Welt. BLV Bestimmungsbuch (2 ed.). p. 223. ISBN 3-405-14003-X.
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