Pseudomalachite
Cu5(PO4)2(OH)4IMA symbol: Pmlcgrandfathered
Pseudomalachite is a phosphate, arsenate, or vanadate mineral with the formula Cu5(PO4)2(OH)4, crystallizing in the monoclinic system. It has a Mohs hardness of 4.5-5, typically black or green in color, with a vitreous luster, a specific gravity of 3.4-4.4. Its streak is green.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 4.4728, b = 5.7469, c = 17.032; α = 90, β = 91.043, γ = 90 |
| Cell volume | 437.73 ų, Z = 2 |
| Axial ratios | 0.7783:1:2.9637calculated from COD 9000589 |
| Source structure | COD 9000589 (American Mineralogist, 1977) |
Powder X-ray diffraction (calculated)
| d (Å) | 4.472 | 3.112 | 2.39 | 2.433 | 2.416 | 2.978 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 41 | 37.8 | 36.5 | 28.5 | 27.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000589; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.337 g/cm³calculated from COD 9000589 |
|---|---|
| Hardness (Mohs) | 4.5-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.4-4.4 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 575.7 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 55.19%, P 10.76%, O 33.35%, H 0.7% |
Classification
| Nickel-Strunz (10th) | 8.BD.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BD.05Wikidata (CC0) |
| Dana (8th) | 41.4.3.1Wikidata (CC0) |