Diaboleite
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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".[3] The mineral has since been found in a number of countries.
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Diaboleite | |
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General | |
Category | Halide mineral |
Formula (repeating unit) | Pb2CuCl2(OH)4 |
IMA symbol | Dbol[1] |
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[2] |
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[2] |
Streak | Pale blue[2] |
Diaphaneity | Transparent to translucent[2] |
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[2] |
Solubility | Completely soluble in nitric acid |
References | [3] |
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