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 |
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 |
Streak
white |
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 |