Descloizite
PbZn(VO4)(OH)IMA symbol: Dczgrandfathered
Descloizite is a phosphate, arsenate, or vanadate mineral with the formula PbZn(VO4)(OH), crystallizing in the orthorhombic system. It has a Mohs hardness of 3-5, typically black, brown or red in color, with a greasy luster, a specific gravity of 5.9-6.2. Its streak is brown or gray.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n m a |
| Cell (Å, °) | a = 7.593, b = 6.057, c = 9.416; α = 90, β = 90, γ = 90 |
| Cell volume | 433.049 ų, Z = 4 |
| Axial ratios | 1.2536:1:1.5546calculated from COD 9011206 |
| Source structure | COD 9011206 (Acta Crystallographica, Section B, 1979) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.217 | 5.094 | 2.901 | 2.616 | 2.656 | 2.695 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 66.4 | 64.3 | 58.3 | 48.6 | 45.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011206; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.19 g/cm³calculated from COD 9011206 |
|---|---|
| Hardness (Mohs) | 3-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5.9-6.2 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brown, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brown, gray, orange, red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | greasysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 404.56 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 51.22%, Zn 16.17%, V 12.59%, O 19.77%, H 0.25% |
Classification
| Nickel-Strunz (10th) | 8.BH.40Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BH.40Wikidata (CC0) |