Back Crookesita Catalan Crookesit German Κρουκσίτης Greek Crookesita EU Crookesite French Crookesite Italian クルックス鉱 Japanese குரூக்கிசைட்டு Tamil
| Crookesite | |
|---|---|
 | |
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | Cu 7(Tl, Ag)Se 4 |
| IMA symbol | Crk[1] |
| Strunz classification | 2.BD.50 |
| Crystal system | Tetragonal |
| Crystal class | Disphenoidal (4) H-M symbol: (4) |
| Space group | I4 |
| Identification | |
| Color | Lead-gray |
| Crystal habit | As finely divided, disseminated specks, and as small veinlets. |
| Cleavage | Good, two at right angles |
| Fracture | Brittle |
| Mohs scale hardness | 2.5–3 |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 6.90 |
| References | [2][3] |
Crookesite is a selenide mineral composed of copper and selenium with variable thallium and silver.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Webmineral site
- ^ Handbook of Mineralogy