Lead Arseno Chloride
Pb5(AsO4)3Cl
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Chemical name
Lead Arseno Chloride |
|
Mineral name
Mimetesite |
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Chemical formula
Pb5(AsO4)3Cl |
|
Crystal system
hexagonal |
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Crystal Class
hexagonal-dipyramidal (6/m) |
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Space Group
P6_3/m |
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Unit cell
a [Å]:10.211 b [Å]:10.211 c [Å]:7.418 |
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Molecular weight [g/mol]
1488,25 |
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Formula units
Z=2 |
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Frequent crystal surfaces
{10-10}, {0001}, {10-11}, {11-21}, {21-31} |
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Twinning
rare on {11-22} |
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Mohs hardness
3.8 - 4 |
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Density [g/cm3]
7.1 – 7.3 |
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Cleavage
imperfect on [10-11] |
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Fracture / Tenacity
conchoidal, brittle |
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Color
pale to bright yellow, yellowish brown, yellow-orange, white, colorless |
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Streak
white |
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Transparency
transparent to translucent |
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Luster
resinous to diamond-like |
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Optical character
uniaxial (-) |
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Refractive Index
nω=2.147; nε=2.128 |
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Birefringence δ
0.019 |
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Pleochroism δ
weak |
