Arsendescloizite
Arsendescloizite is a lead-zinc mineral, approved by the IMA in 1982. It is an arsenate analog of descloizite. Its first description was published in 1982.
| Arsendescloizite | |
|---|---|
Arsendescloizite (green) with mimetite (yellow), from Durango, Mexico | |
| General | |
| Category | Arsenate mineral |
| Formula (repeating unit) | PbZn(AsO4)(OH) |
| IMA symbol | Adcz |
| Strunz classification | 8.BH.35 |
| Dana classification | 41.5.1.9 |
| Crystal system | Orthorhombic |
| Crystal class | Disphenoidal H-M symbol: 2 2 2 |
| Space group | P21 21 21 |
| Unit cell | 433.99 |
| Identification | |
| Color | Pale yellow to deep green, greyish brown |
| Mohs scale hardness | 4 |
| Luster | Sub-vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 6.57 |
| Density | 6.57 |
| Optical properties | Biaxial (−) |
| Refractive index | nα = 1.990 nβ = 2.030 nγ = 2.035 |
| Birefringence | 0.045 |
| Pleochroism | None |
| 2V angle | Measured: 30° Calculated: 38° |
| Dispersion | r > v |
| Extinction | XYZ = bac |
| Ultraviolet fluorescence | None |
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