Lavendulan
NaCaCu5(AsO4)4Cl·5H2OIMA symbol: Lvdgrandfathered
Lavendulan is a phosphate, arsenate, or vanadate mineral with the formula NaCaCu5(AsO4)4Cl·5H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2.75, a calculated density of 3.563 g/cm3. Its streak is light blue.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/n 1 |
| Cell (Å, °) | a = 10.011, b = 19.478, c = 10.056; α = 90, β = 90.37, γ = 90 |
| Cell volume | 1960.82 ų, Z = 4 |
| Axial ratios | 0.5140:1:0.5163calculated from COD 9010781 |
| Source structure | COD 9010781 (European Journal of Mineralogy, 2007) |
Powder X-ray diffraction (calculated)
| d (Å) | 9.739 | 3.121 | 2.978 | 4.868 | 2.968 | 3.079 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 14.3 | 11.8 | 10.1 | 9.7 | 9 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010781; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.563 g/cm³calculated from COD 9010781 |
|---|---|
| Hardness (Mohs) | 2.75single sourceWikidata (CC0) |
| Streak | light bluesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 1062.0 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 2.16%, Ca 3.77%, Cu 29.92%, As 28.22%, O 31.64%, Cl 3.34%, H 0.95% |
Classification
| Nickel-Strunz (10th) | 8.DG.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.DG.05Wikidata (CC0) |
| Dana (8th) | 42.9.4.2Wikidata (CC0) |