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clarkeite
EntityQ1062405· pop 12· linked from 6 articles

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

via Wikipedia infobox

~1 min read

Encyclopedic overview

2 sections
Contents
  • See also
  • References

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.

Excerpted from Wikipedia’s “clarkeite” article, available under the CC BY-SA 4.0 licence.