Tyrrellite
Tyrrellite is a selenide mineral that has a chemical 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.
| Tyrrellite | |
|---|---|
| General | |
| Category | Selenide mineral Thiospinel group (Spinel structural group) |
| Formula (repeating unit) | Cu(Co,Ni)2Se4 |
| IMA symbol | Ty |
| Strunz classification | 2.DA.05 |
| Crystal system | Isometric |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| Space group | Fd3m |
| Unit cell | a= 10.005 Å; Z = 8 |
| Identification | |
| Color | light bronze |
| Crystal habit | granular |
| Cleavage | {001} Distinct |
| Fracture | conchoidal |
| Tenacity | brittle |
| Mohs scale hardness | 3.5 |
| Luster | metallic |
| Streak | black |
| Diaphaneity | Opaque |
| Specific gravity | 6.6 ± 0.2 |
| References | |
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