clarkeite
Sign in to saveClarkeite 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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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.