Tyrrellite
A variety of Minerals
What is Tyrrellite?
Tyrrellite is a selenide mineral that has a formula of Cu(Co,Ni)2Se4. It has been found in the Goldfields District in northern Saskatchewan, as well as in the Petrovice deposit, Czech Republic. It is named after the Canadian geologist Joseph Burr Tyrrell. Joseph Tyrrell was one of the first geologists from the Geological Survey of Canada to do research in the Goldfields District.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tyrrellite 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.
Tyrrellite Localities Map
See where Tyrrellite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Tyrrellite
It was first described in 1953 for an occurrence in the Goldfields District, Saskatchewan, while the second occurrence was reported in Petrovice deposit, Czech Republic. In general, tyrrellite is veined, embayed and replaced by umangite, a primary mineral of deposits in which tyrellite is found. The relative scarcity and unique occurrences of tyrrellite can give geologists considerable insight into the circumstances under which the parent rock formed.
Quick Facts
Physical Properties
- Color
- Bronze
- Hardness (Mohs)
- 3.5
- Density
- 6.59 g/cm³
- Streak
- Black
Chemical Properties
- Chemical Formula
- Cu(Co3+,Ni3+)2Se4
- Elements
- Co, Cu, Ni, Se
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Tyrrellite FAQs
How do I identify Tyrrellite?
Tyrrellite can be identified by its hardness of 3.5 on the Mohs scale, Bronze color. Look for these key characteristics when examining specimens.
What color is Tyrrellite?
Tyrrellite typically appears in Bronze. Color can vary depending on impurities and formation conditions.
How hard is Tyrrellite?
Tyrrellite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.
What is the formation of tyrrellite of Tyrrellite?
It was first described in 1953 for an occurrence in the Goldfields District, Saskatchewan, while the second occurrence was reported in Petrovice deposit, Czech Republic. In general, tyrrellite is veined, embayed and replaced by umangite, a primary mineral of deposits in which tyrellite is found. The relative scarcity and unique occurrences of tyrrellite can give geologists considerable insight into the circumstances under which the parent rock formed.
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