Zeunerite
Cu(UO2)2(AsO4)2·12H2OIMA symbol: Zeugrandfathered
Zeunerite is a phosphate, arsenate, or vanadate mineral with the formula Cu(UO2)2(AsO4)2·12H2O, crystallizing in the tetragonal system. It has a Mohs hardness of 2-2.5, typically green in color, with a pearly luster, a specific gravity of 3.2. Cleavage is distinct or perfect.
Photos
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 4/n n c :2 |
| Cell (Å, °) | a = 7.1797, b = 7.1797, c = 20.857; α = 90, β = 90, γ = 90 |
| Cell volume | 1075.14 ų, Z = 2 |
| Axial ratios | 1.0000:1:2.9050calculated from COD 9004738 |
| Source structure | COD 9004738 (The Canadian Mineralogist, 2003) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 10.428 | 3.607 | 3.59 | 3.394 | 6.789 | 4.994 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 63.3 | 48.6 | 43.8 | 32.7 | 26.4 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004738; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.391 g/cm³calculated from COD 9004738 |
|---|---|
| Hardness (Mohs) | 2.5single sourceWikidata (CC0) 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.2 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearlysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | distinct, perfectDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1097.62 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 5.79%, U 43.37%, O 34.98%, As 13.65%, H 2.2% |
Classification
| Nickel-Strunz (10th) | 8.EB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.EB.05Wikidata (CC0) |
| Dana (8th) | 40.2a.14.1Wikidata (CC0) |