Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombicraresulfides
Cobaltite
CoAsS
This specimen features excellent, rare, silvery-white to slightly golden metallic cubic cobaltite crystals embedded in a dark matrix, characteristic of finds from the Sudbury District.
Cobaltite Physical Properties
Mohs Hardness
5.5Crystal System
orthorhombicLuster
metallicStreak Color
greyish blackCleavage
good on {100}Fracture
unevenSpecific Gravity
6.3Colors
silvery white, steel-gray, reddish tingeTransparency
opaqueType Locality
Espanola, Foster Township, Sudbury District, Ontario, CanadaMineral Group
sulfidesUses
ore of cobalt, collector's specimensAssociated Minerals
arsenopyrite, chalcopyrite, pyrite, calcite, quartzRarity
rareGeological Context
Cobaltite typically forms in high-temperature hydrothermal veins, contact metamorphic deposits, and sometimes in pegmatites, often associated with other cobalt-nickel-iron sulfides and arsenides.
