crookesite

Crookesite 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

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Wikidata facts

Image: Crookesite.jpg

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 2.BD.50
chemical formula: Cu₇TlSe₄
Nickel-Strunz 9th edition (updated 2009): 2.BD.50
Commons category: Crookesite
IMA Mineral Symbol: Crk
Strunz 8th edition (series ID, updated): II/A.04

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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.