Anapaite
Ca2Fe2+(PO4)2·4H2OIMA symbol: Anpgrandfathered
Anapaite is a phosphate, arsenate, or vanadate mineral with the formula Ca2Fe2+(PO4)2·4H2O, crystallizing in the triclinic system. It has a Mohs hardness of 3.5, typically pink in color, a specific gravity of 3.2. Its streak is white; cleavage is perfect.
Photos
Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P -1 |
| Cell (Å, °) | a = 6.447, b = 6.816, c = 5.898; α = 101.64, β = 104.24, γ = 70.76 |
| Cell volume | 235.108 ų, Z = 1 |
| Axial ratios | 0.9459:1:0.8653calculated from COD 9009706 |
| Source structure | COD 9009706 (Bulletin de Mineralogie, 1979) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.882 | 3.155 | 3.762 | 6.379 | 3.389 | 3.19 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 87.5 | 70.7 | 49.8 | 46.9 | 42.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009706; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.811 g/cm³calculated from COD 9009706 |
|---|---|
| Hardness (Mohs) | 3.5single sourceWikidata (CC0) |
| Specific gravity | 3.2 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | pinksingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | whitesingle sourceWikidata (CC0) |
| Cleavage | perfectFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Classification
| Nickel-Strunz (10th) | 8.CH.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CH.10Wikidata (CC0) |