$385Median
6Sold (12 mo)
$400Last sale
Cobaltite specimens for sale
49 for sale · $35–$15,000 USD
157 in the gallery
Cobaltite is a cobalt arsenide mineral that crystallizes in the isometric system, commonly presenting metallic to submetallic luster and a silver-gray to steel-gray coloration. It often forms compact grains or coarse, well-formed crystals, occasionally displaying greys and hints of bronze on weathered surfaces. The mineral's distinctive metallic sheen and abrupt crystal faces make it a recognizable specimen for cabinet collections.
- Formula
- CoAsS
- Rarity
- Rare
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
- Classification notes
- Sulfarsenide; Strunz 2.EA
Key characteristics
- Crystal system
- orthorhombic
- Mohs hardness
- 5.5
- Specific gravity
- 6–6.3
- Luster
- metallic
- Transparency
- opaque
- Color
- white, gray, black
- Streak
- gray, black
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- cubic, octahedral, dodecahedral, granular, massive
- Classic / historic
Buy Cobaltite specimens
View all 49Where Cobaltite is found
Top localities
- Tunaberg8 specimens
- Håkansbo Mines2 specimens
- Schneeberg2 specimens
- Keeley-Frontier Mine1 specimen
- Ontario1 specimen
- Schneeberg mining district1 specimen
- Weisser Hirsch mine, Schneeberg, Erzgebirgskreis1 specimen
- Pnerd Claim1 specimen
About Cobaltite
Notable specimens originate from classic cobalt-bearing localities in Sweden, Canada, Chile and Argentina, where cobalt-rich hydrothermal processes have produced well-formed crystals in alpine veins and skarn environments. Collectors value clean, lustrous crystals and aesthetically pleasing crystal clusters, especially when dark colors contrast with contrasting matrix minerals. Cobaltite's historical importance in cobalt ore studies and its relative rarity in pristine form contribute to its appeal for mineral enthusiasts seeking characterful metallic specimens.
