crookesite
Sign in to saveCrookesite is a selenide mineral composed of copper and selenium with variable thallium and silver.
Key facts
- Mineral.name
- Crookesite
- Mineral.category
- Selenide mineral
- Mineral.image
- File:Crookesite.jpg
- Mineral.IMAsymbol
- Crk
- Mineral.strunz
- 2.BD.50
- Mineral.system
- Tetragonal
- Mineral.class
- Disphenoidal () H-M symbol: ()
- Mineral.symmetry
- I
- Mineral.color
- Lead-gray
- Mineral.habit
- As finely divided, disseminated specks, and as small veinlets.
- Mineral.cleavage
- Good, two at right angles
- Mineral.fracture
- Brittle
- Mineral.mohs
- 2.5–3
- Mineral.luster
- Metallic
- Mineral.gravity
- 6.90
- Mineral.diaphaneity
- Opaque
via Wikipedia infobox
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Encyclopedic overview
4 sectionsContents
- Characteristics
- Name and discovery
- See also
- References
Crookesite is a selenide mineral composed of copper and selenium with variable thallium and silver.
==Characteristics== Its chemical formula is reported either as or . It is formed by precipitation from hydrothermal fluids, and contains by mass: 16.3% Tl, 47.3% Cu, 2.9% Ag, and 33.6% Se.
Excerpted from Wikipedia’s “crookesite” article, available under the CC BY-SA 4.0 licence.