clarkeite

Clarkeite is a uranium oxide mineral with the chemical formula or .

Key facts

Mineral.name: Clarkeite
Mineral.formula: or
Mineral.IMAsymbol: Cke
Mineral.strunz: 4.GC.05
Mineral.dana: 5.4.1.1
Mineral.system: Trigonal
Mineral.symmetry: Rm (No. 166)
Mineral.unit cell: 239.11 Å3 (Calculated from unit cell)
Mineral.colour: Dark red-brown, dark brown
Mineral.cleavage: None observed
Mineral.fracture: Conchoidal, sub-conchoidal
Mineral.mohs: 4–4.5
Mineral.luster: Resinous, waxy, greasy
Mineral.streak: Yellow-brown
Mineral.diaphaneity: Translucent
Mineral.gravity: 6.39
Mineral.density: 6.39 g/cm3 (Measured)
Mineral.birefringence: 0.111

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Wikidata facts

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Strunz 8th edition (series ID, updated): IV/F.14
IMA Mineral Symbol: Cke
chemical formula: (Na,Ca,Pb)(UO₂)O(OH) * ₀-₁H₂O
Nickel-Strunz 9th edition (updated 2009): 4.GC.05
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.GC.05

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Clarkeite is a uranium oxide mineral with the chemical formula or .

Its color varies from dark brown to reddish orange. Clarkeite forms by oxidation and replacement of uraninite late during pegmatite crystallization. Although uraninite-bearing granite pegmatites are common, clarkeite is rare and occurs intimately intergrown with other uranium minerals.