Carnotite
K2(UO2)2(VO4)2·3H2OIMA symbol: Cntgrandfathered
Carnotite is an oxide or hydroxide mineral with the formula K2(UO2)2(VO4)2·3H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2, a calculated density of 5.031 g/cm3. Its streak is yellow.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 6.59, b = 8.403, c = 10.43; α = 90, β = 104.2, γ = 90 |
| Cell volume | 559.922 ų, Z = 4 |
| Axial ratios | 0.7842:1:1.2412calculated from COD 9012741 |
| Source structure | COD 9012741 (Arkiv for Kemi, 1949) |
Powder X-ray diffraction (calculated)
| d (Å) | 6.389 | 3.128 | 3.51 | 5.056 | 4.544 | 3.102 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 33.4 | 33.2 | 20.8 | 19.1 | 18.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012741; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.031 g/cm³calculated from COD 9012741 |
|---|---|
| Hardness (Mohs) | 2single sourceWikidata (CC0) |
| Streak | yellowsingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 902.18 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | K 8.67%, U 52.77%, O 26.6%, V 11.29%, H 0.67% |
Classification
| Nickel-Strunz (10th) | 4.HB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.HB.05Wikidata (CC0) |
| Dana (8th) | 40.2a.28.1Wikidata (CC0) |