Siegenite
A variety of Minerals
What is Siegenite?
Siegenite is a cobalt nickel sulfide mineral with formula: (Ni,Co)3S4 (a member of the thiospinel group). It occurs as opaque steel gray octahedral crystals associated with other sulfides.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Siegenite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Siegenite Localities Map
See where Siegenite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Siegenite
It was first described in 1850 for an occurrence in the Stahlberg Mine in Müsen, Siegerland, North Rhine-Westphalia, Germany and named for the locality. It occurs in hydrothermal copper-nickel-iron sulfide bearing veins associated with chalcopyrite, pyrrhotite, galena, sphalerite, pyrite, millerite, gersdorffite and ullmannite. It occurs in a variety of deposits worldwide, including Brestovsko in the central Bosnian Mountains of Serbia; at Kladno in the Czech Republic; Blackcraig, Kirkcudbrightshire, Scotland. In the United States occurrences include the Mine la Motte of Madison County and the Buick mine, Bixby, Iron County and in the Sweetwater mine of Reynolds County in the Lead Belt of Missouri. In Canada, it is known from the Langis mine, Cobalt-Gowganda area, Ontario. In Africa it occurs at Shinkolobwe, Katanga Province and Kilembe, Uganda. In Japan it is reported from the Kamaishi mine, Iwate Prefecture, and the Yokozuru mine, north Kyushu. It also occurs at Kalgoorlie, Western Australia. It is found at the Browns deposit, Batchelor, Northern Territory, Australia.
Quick Facts
Physical Properties
- Color
- Light to steel-grey, violet-gray (tarnished)
- Hardness (Mohs)
- 4.5 - 5.5
- Density
- 4.83 g/cm³
- Streak
- Greyish black
Chemical Properties
- Chemical Formula
- CoNi2S4 CoNi2S4 is the IMA-approved formula. The mineral is also defined by a range of composition: CoNi2S4-NiCo2S4. The pure Co- and Ni-endmembers are linnaeite and polydymite, respectively.
- Elements
- Co, Ni, S
Also Known As
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Siegenite FAQs
How do I identify Siegenite?
Siegenite can be identified by its hardness of 4.5 - 5.5 on the Mohs scale, Light to steel-grey color. Look for these key characteristics when examining specimens.
What color is Siegenite?
Siegenite typically appears in Light to steel-grey, violet-gray (tarnished). Color can vary depending on impurities and formation conditions.
How hard is Siegenite?
Siegenite has a hardness of 4.5 - 5.5 on the Mohs scale. This gives it moderate hardness.
What is the formation of siegenite of Siegenite?
It was first described in 1850 for an occurrence in the Stahlberg Mine in Müsen, Siegerland, North Rhine-Westphalia, Germany and named for the locality. It occurs in hydrothermal copper-nickel-iron sulfide bearing veins associated with chalcopyrite, pyrrhotite, galena, sphalerite, pyrite, millerite, gersdorffite and ullmannite. It occurs in a variety of deposits worldwide, including Brestovsko in the central Bosnian Mountains of Serbia; at Kladno in the Czech Republic; Blackcraig, Kirkcudbrightshire, Scotland. In the United States occurrences include the Mine la Motte of Madison County and the Buick mine, Bixby, Iron County and in the Sweetwater mine of Reynolds County in the Lead Belt of Missouri. In Canada, it is known from the Langis mine, Cobalt-Gowganda area, Ontario. In Africa it occurs at Shinkolobwe, Katanga Province and Kilembe, Uganda. In Japan it is reported from the Kamaishi mine, Iwate Prefecture, and the Yokozuru mine, north Kyushu. It also occurs at Kalgoorlie, Western Australia. It is found at the Browns deposit, Batchelor, Northern Territory, Australia.
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