| General Information |
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| Chemical Formula | Anthony et al, Handbook of mineralogy (2001) |
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| Photos of natural/un-cut material from mindat.org |
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| Physical Properties of Cobaltite |
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| Mohs Hardness | 5.5Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Specific Gravity | 6.3Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | PerfectMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Fracture | UnevenAnthony et al, Handbook of mineralogy (2001) More from other references |
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| Optical Properties of Cobaltite |
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| Refractive Index | Out of the range of gemmological instrumentsMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Pleochroism | Very weak, on grain boundariesAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Silver to greyish blackMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Transparency | OpaqueMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Lustre | MetallicArthur Thomas, Gemstones (2009) |
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| Crystallography of Cobaltite |
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| Crystal System | OrthorhombicMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Habit | Pseudocubic or pseudopyritohedralMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | In high-temperature hydrothermal deposits, as disseminations, and as veins in contact metamorphosed rocks.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Cobaltite information at mindat.org |
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| Significant Gem Localities |
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