Lead Phosphoro Chloride
Pb5(PO4)3Cl
|
Chemical name
Lead Phosphoro Chloride |
|
Mineral name
Pyromorphite |
|
Chemical formula
Pb5(PO4)3Cl |
|
Crystal system
hexagonal |
|
Crystal Class
hexagonal-dipyramidal (6/m) |
|
Space Group
P6_3/m |
|
Unit cell
a [Å]:9.97 b [Å]:9.97 c [Å]:7.32 |
|
Molecular weight [g/mol]
1356,36 |
|
Formula units
Z=2 |
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Frequent crystal surfaces
{10-10}, {0001}, {10-11}, {20-21}, {11-21} |
|
Twinning
rarely on {11-22} |
|
Mohs hardness
3.5 - 4 |
|
Density [g/cm3]
6.7 - 7 |
|
Cleavage
imperfect on [10-11] |
|
Fracture / Tenacity
brittle, uneven to conchoidal |
|
Color
dark green to green, yellow, yellow-orange, reddish-orange, yellow-brown to brown, tan, grayish to colorless |
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Streak
white |
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Transparency
transparent to translucent |
|
Luster
resinous to subadamantine |
|
Optical character
uniaxial (-) |
|
Refractive Index
nω=2.058; nε=2.048 |
|
Birefringence δ
0.010 |
|
Pleochroism δ
weak |
