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| Wulfenite | |
|---|---|
| General | |
| Category | Molybdate mineral |
| Formula | PbMoO4 |
| IMA symbol | Wul |
| Strunz classification | 7.GA.05 |
| Crystal system | Tetragonal |
| Crystal class | Dipyramidal (4/m) / H-M symbol : (4/m) |
| Space group | I 41/a |
| Unit cell | a = 5.433, c = 12.110 [Å]; Z = 4 |
| Identification | |
| Color | Orange-yellow, yellow, honey-yellow, reddish-orange, rarely colorless, grey, brown, olive-green and even black |
| Crystal habit | Thin tabular to pyramidal |
| Twinning | Twins on the [001] common |
| Cleavage | On {011}, distinct; on {001}, {013}, indistinct |
| Fracture | Irregular to sub-conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 3 |
| Luster | Adamantine, resinous |
| Streak | White |
| Diaphaneity | Transparent to opaque |
| Specific gravity | 6.5–7.0 |
| Optical properties | Uniaxial (−), may be anomalously biaxial |
| Refractive index | nω = 2.405 nε = 2.283 |
| Birefringence | δ = 0.122 |
| Pleochroism | Weak; orange and yellow |
| Ultraviolet fluorescence | None |
| Other characteristics | Specimens may be piezoelectric |
Wikipedia
Molybdate mineral
Wulfenite is a lead molybdate mineral with the formula PbMoO4. It often occurs as thin tabular crystals with a bright orange-red to yellow-orange color, sometimes brown, although the color can be highly variable. In its yellow form it is sometimes called "yellow lead ore".