Purpurite
Mn3+(PO4)IMA symbol: Purgrandfathered
Purpurite is a phosphate, arsenate, or vanadate mineral with the formula Mn3+(PO4). It has a Mohs hardness of 5, typically purple or red in color, a specific gravity of 3.4. Its streak is red.
Photos
Crystallography
| Space group | P b n m |
|---|---|
| Cell (Å, °) | a = 4.76, b = 9.68, c = 5.819; α = 90, β = 90, γ = 90 |
| Cell volume | 268.1 ų, Z = 4 |
| Axial ratios | 0.4917:1:0.6011calculated from COD 1011230 |
| Source structure | COD 1011230 (Geologiska Foereningens i Stockholm Foerhandlingar, 1938) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.427 | 3.443 | 2.91 | 1.722 | 4.84 | 4.272 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 84 | 62.5 | 36.1 | 31.2 | 29.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1011230; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.722 g/cm³calculated from COD 1011230 |
|---|---|
| Hardness (Mohs) | 5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 3.4 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | purple, redFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | redsingle sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 8.AB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.AB.10Wikidata (CC0) |