Strengite
Fe3+(PO4)·2H2OIMA symbol: Stggrandfathered
Strengite is a phosphate, arsenate, or vanadate mineral with the formula Fe3+(PO4)·2H2O, crystallizing in the orthorhombic system. It has a Mohs hardness of 3-4, typically colorless or red in color, with a vitreous luster, a specific gravity of 2.87. Its streak is white or yellow.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P b c a |
| Cell (Å, °) | a = 8.722, b = 9.878, c = 10.1187; α = 90, β = 90, γ = 90 |
| Cell volume | 871.786 ų, Z = 8 |
| Axial ratios | 0.8830:1:1.0244calculated from COD 9010007 |
| Source structure | COD 9010007 (Crystal Research and Technology, 2004) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 4.376 | 5.491 | 3.111 | 2.998 | 2.947 | 3.99 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 67.5 | 62.7 | 40 | 37.7 | 34.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010007; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.847 g/cm³calculated from COD 9010007 |
|---|---|
| Hardness (Mohs) | 3-4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.87 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | colorless, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 8.CD.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CD.10Wikidata (CC0) |