- Chemistry: Co3S4,
- Class: Sulfides
- Uses: As an important ore of cobalt and as
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.
PHYSICAL CHARACTERISTICS OF LINNAEITE:
- 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
- Steak is black.
- Other Characteristics: A red to violet tarnish forms on weathered specimens.
- Associated Minerals include
- Notable Occurrences include Katanga, Zaire; Zambia; Maryland and California, USA and Seigen, Germany.
- Best Field Indicators are crystal habit, streak, associations, tarnish and color.