Torbernite
Cu(UO2)2(PO4)2·12H2OIMA symbol: Torapproved
Torbernite is a phosphate, arsenate, or vanadate mineral with the formula Cu(UO2)2(PO4)2·12H2O, crystallizing in the tetragonal system. It has a Mohs hardness of 2-2.5, typically green in color, with an adamantine or pearly luster, a specific gravity of 5. Its streak is green; cleavage is perfect.
Photos
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 4/n n c :2 |
| Cell (Å, °) | a = 7.0267, b = 7.0267, c = 20.807; α = 90, β = 90, γ = 90 |
| Cell volume | 1027.33 ų, Z = 2 |
| Axial ratios | 1.0000:1:2.9611calculated from COD 9004737 |
| Source structure | COD 9004737 (The Canadian Mineralogist, 2003) |
Powder X-ray diffraction (calculated)
| d (Å) | 10.403 | 3.581 | 3.513 | 4.969 | 3.329 | 6.657 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 82.4 | 50.6 | 49.5 | 43.4 | 39.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004737; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.264 g/cm³calculated from COD 9004737 |
|---|---|
| Hardness (Mohs) | 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greenDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, pearlyDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1009.73 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 6.29%, U 47.15%, O 38.03%, P 6.14%, H 2.4% |
Classification
| Nickel-Strunz (10th) | 8.EB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.EB.05Wikidata (CC0) |
| Dana (8th) | 40.2a.13.1Wikidata (CC0) |