• Chemistry: Co3S4, Cobalt Sulfide.
  • Class: Sulfides
  • Uses: As an important ore of cobalt and as mineral specimens.
  • Specimens

Linnaeite is not a well known mineral but is still an important ore of the strategically valuable metal cobalt. It commonly forms with other cobalt sulfides but usually as just a trace. In a few areas it has formed in large quantities and has become a valuable ore in mines in Zaire and Zambia.


  • Color is gray to white, usually with a tarnish if exposed to weathering.
  • Luster is metallic.
  • Transparency crystals are opaque.
  • Crystal System is isometric.
  • Crystal Habits include small octahedral crystals, usually well formed, and as granular masses in sulfide rocks.
  • Cleavage is imperfect.
  • Fracture is uneven.
  • Hardness is 4.5 - 5.5
  • Specific Gravity is approximately 4.8 (average for metallic minerals)
  • Steak is black.
  • Other Characteristics: A red to violet tarnish forms on weathered specimens.
  • Associated Minerals include covellite, chalcocite bornite and chalcopyrite
  • Notable Occurrences include Katanga, Zaire; Zambia; Maryland and California, USA and Seigen, Germany.
  • Best Field Indicators are crystal habit, streak, associations, tarnish and color.
This Site Awarded
Available LINNAEITE specimens:
see this List of ALL specimens including SOLD ones


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