Roselite
Ca2Co(AsO4)2·2H2OIMA symbol: Rslgrandfathered
Roselite is a phosphate, arsenate, or vanadate mineral with the formula Ca2Co(AsO4)2·2H2O, crystallizing in the monoclinic system. It has typically white, green or yellow in color, a specific gravity of 3.07-3.16. Its streak is pink.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 5.801, b = 12.898, c = 5.617; α = 90, β = 107.42, γ = 90 |
| Cell volume | 400.996 ų, Z = 2 |
| Axial ratios | 0.4498:1:0.4355calculated from COD 9004113 |
| Source structure | COD 9004113 (The Canadian Mineralogist, 1977) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.992 | 3.354 | 3.224 | 2.757 | 5.086 | 2.763 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 51.1 | 37 | 36.6 | 36 | 32.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004113; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.579 g/cm³calculated from COD 9004113 |
|---|---|
| Specific gravity | 3.07-3.16 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | green, white, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | pinksingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 452.96 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 17.7%, Co 13.01%, As 33.08%, O 35.32%, H 0.89% |
Classification
| Nickel-Strunz (10th) | 8.CG.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CG.10Wikidata (CC0) |
| Dana (8th) | 40.2.3.1Wikidata (CC0) |