Carnotite
Radioactive mineral / From Wikipedia, the free encyclopedia
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Not to be confused with Carnallite.
Carnotite is a potassium uranium vanadate radioactive mineral with chemical formula K2(UO2)2(VO4)2·3H2O. The water content can vary and small amounts of calcium, barium, magnesium, iron, and sodium are often present.
Quick Facts General, Category ...
Carnotite | |
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General | |
Category | Vanadate mineral |
Formula (repeating unit) | K2(UO2)2 (VO4)2·3H2O |
IMA symbol | Cnt[1] |
Strunz classification | 4.HB.05 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/a |
Unit cell | a = 10.47 Å, b = 8.41 Å, c = 6.91 Å; β = 103.83°; Z = 2 |
Identification | |
Color | Bright yellow to lemon-yellow, may be greenish yellow. |
Crystal habit | Crusts, earthy masses, foliated and granular aggregates. |
Twinning | On {001} as both twin and composition plane |
Cleavage | Perfect on {001}, micaceous |
Fracture | uneven |
Mohs scale hardness | 2 |
Luster | Dull, earthy; silky when crystalline |
Streak | yellow |
Diaphaneity | Semitransparent |
Specific gravity | 4.70 |
Optical properties | Biaxial (−) |
Refractive index | nα=1.750 – 1.780, nβ=1.901 – 2.060, nγ=1.920 – 2.080 |
Birefringence | δ = 0.200 |
2V angle | Measured: 43° to 60°, Calculated: 26° to 36° |
Other characteristics | Radioactive, not fluorescent |
References | [2][3][4][5][6] |
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