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Matlockite
From Wikipedia, the free encyclopedia
Matlockite is a rare lead halide mineral, named after the town of Matlock in Derbyshire, England, where it was first discovered in a nearby mine.[3] Matlockite (chemical formula: PbFCl) gives its name to the matlockite group which consists of rare minerals of a similar structure.
Quick Facts General, Category ...
Matlockite | |
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General | |
Category | Halide minerals |
Formula (repeating unit) | PbFCl |
IMA symbol | Mtl[1] |
Strunz classification | 3.DC.25 |
Dana classification | 9.2.11.1 |
Crystal system | Tetragonal |
Crystal class | Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) |
Space group | P4/nmm |
Unit cell | a = 4.11 Å, c = 7.23 Å; Z = 2 |
Identification | |
Colour | Colourless to yellow and greenish |
Crystal habit | Flattened, tabular crystals occurring as aggregates, rosettelike, radiating, hemispherical; also massive |
Cleavage | {001}, perfect |
Fracture | Uneven to subconchoidal |
Tenacity | Brittle |
Mohs scale hardness | 2.5 – 3 |
Luster | Adamantine, pearly on {001} |
Diaphaneity | Transparent |
Specific gravity | 7.1 – 7.2 |
Optical properties | Uniaxial (−) |
Refractive index | nω = 2.150 nε = 2.040 |
References | [2][3][4] |
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