EntityQ430083· pop 10· linked from 14 articles

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

via Wikipedia infobox

Article

4 sections

Contents

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.