Wulfenite
PbMoO4IMA symbol: Wulgrandfathered
Wulfenite is a sulfate mineral with the formula PbMoO4, crystallizing in the tetragonal system. It has a Mohs hardness of 2.75-3, typically colorless, white, brown or gray in color, with an adamantine or resinous luster, a specific gravity of 6.7-7. Its streak is white.
Photos
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I 41/a :2 |
| Cell (Å, °) | a = 5.434, b = 5.434, c = 12.107; α = 90, β = 90, γ = 90 |
| Cell volume | 357.5 ų, Z = 4 |
| Axial ratios | 1.0000:1:2.2280calculated from COD 9009404 |
| Source structure | COD 9009404 (Neues Jahrbuch fur Mineralogie, Monatshefte, 1999) — 1 of 4 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.244 | 2.022 | 1.653 | 2.717 | 1.786 | 3.027 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 29.2 | 27.4 | 23.6 | 17.6 | 16.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009404; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.821 g/cm³calculated from COD 9009404 |
|---|---|
| Hardness (Mohs) | 3single sourceWikidata (CC0) 2.5single sourceWikidata (CC0) 2.75-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.7-7 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, colorless, gray, green, orange, red, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 367.14 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 56.44%, Mo 26.13%, O 17.43% |
Classification
| Nickel-Strunz (10th) | 7.GA.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.GA.05Wikidata (CC0) |
| Dana (8th) | 48.1.3.1Wikidata (CC0) |