Phosphosiderite
Fe3+(PO4)·2H2OIMA symbol: Phsdrenamed
Phosphosiderite is a phosphate, arsenate, or vanadate mineral with the formula Fe3+(PO4)·2H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 3.75, typically red or violet in color, a specific gravity of 2.76. Cleavage is perfect.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/n 1 |
| Cell (Å, °) | a = 5.3, b = 9.77, c = 8.73; α = 90, β = 90.6, γ = 90 |
| Cell volume | 452.023 ų, Z = 4 |
| Axial ratios | 0.5425:1:0.8936calculated from COD 9000140 |
| Source structure | COD 9000140 (American Mineralogist, 1966) |
Powder X-ray diffraction (calculated)
| d (Å) | 4.365 | 4.658 | 2.775 | 3.592 | 4.885 | 6.51 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 85.5 | 60.8 | 48.9 | 45.6 | 36.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000140; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.686 g/cm³calculated from COD 9000140 |
|---|---|
| Hardness (Mohs) | 3.75single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.76 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | red, violetsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 8.CD.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CD.05Wikidata (CC0) |