Diaboleite
Diaboleite is a blue-colored mineral with formula Pb2CuCl2(OH)4. It was discovered in England in 1923 and named diaboleite, from the Greek word διά and boleite, meaning "distinct from boleite". The mineral has since been found in a number of countries.
| Diaboleite | |
|---|---|
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | Pb2CuCl2(OH)4 |
| IMA symbol | Dbol |
| Strunz classification | 3.DB.05 |
| Dana classification | 10.6.1.1 |
| Crystal system | Tetragonal |
| Crystal class | Ditetragonal pyramidal (4mm) H-M symbol: (4mm) |
| Space group | P4mm |
| Unit cell | a = 5.880, c = 5.500 Å, Z = 1 |
| Identification | |
| Color | Blue |
| Crystal habit | As square tabular crystals, thin plates, massive |
| Cleavage | Perfect on {001} |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 2.5 |
| Luster | Adamantine, pearly on cleavages |
| Streak | Pale blue |
| Diaphaneity | Transparent to translucent |
| Density | 5.41 to 5.43 g/cm3 |
| Optical properties | Uniaxial (−) |
| Refractive index | nω = 1.980, nε = 1.850 |
| Birefringence | δ = 0.130 |
| Absorption spectra | O > E, in thick fragments |
| Solubility | Completely soluble in nitric acid |
| References | |
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