Lead Tungstate
PbWO4
|
Chemical name
Lead Tungstate |
|
Mineral name
Stolzite (Lead tungstate) |
|
Chemical formula
PbWO4 |
|
Melting point [°C]
851.85 |
|
Crystal system
tetragonal |
|
Crystal Class
tetragonal-dipyramidal (4/m) |
|
Space Group
I4_1/a |
|
Unit cell
a [Å]:5.50 b [Å]:5.50 c [Å]:12.12 |
|
Molecular weight [g/mol]
455.04 |
|
Formula units
Z=4 |
|
Frequent crystal surfaces
{111}, {101}, {011}, {112}, {001} |
|
Mohs hardness
2.5 - 3 |
|
Density [g/cm3]
8.28 |
|
Cleavage
cleavage plane on (101), imperfect on {001}, indistinct on {011} |
|
Fracture / Tenacity
brittle, conchoidal to uneven |
|
Color
reddish-brown, brown, yellowish-gray, smoky-gray, straw-yellow, lemon-yellow, may be green, orange, red |
|
Streak
white |
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Transparency
translucent to transparent |
|
Luster
resinous, subadamantine |
|
Optical character
uniaxial (-) |
|
Refractive Index
nω=2.270; nε=2.180-2.190 |
|
Birefringence δ
0.090 |
