tetragonal Tungstates
Wulfenite
Formula PbMoO4
Crystal Structure
#! Species: Wulfenite
#! System: Tetragonal (4/m)
#! Habit: Thin tabular square plates
tetragonal[4/m]:{001}@1.0 + {101}@0.4
tetragonal
4/m
{001} {101}
Quick Facts
Hardness
2.5
Specific Gravity
6.7
Refractive Index
2.28
Optical Character
Uniaxial -
Physical Properties
- Crystal System
- tetragonal
- Hardness (Mohs)
- 2.5
- Specific Gravity
- 6.7
- Cleavage
- Distinct {101}
- Fracture
- Subconchoidal to uneven
- Lustre
- Adamantine to resinous
Optical Properties
- Refractive Index
- 2.28
- Birefringence
- 0.12-0.122
- Optical Character
- Uniaxial -
- Dispersion
- 0.203
- Pleochroism
- Very weak to none
Characteristics
Colours
Bright orangeOrange-redRedYellowBrownish-orange
Localities
Arizona (USA - Red Cloud Mine, Rowley Mine)Mexico (Los Lamentos)MoroccoSlovenia (Mezica)Australia
Crystal Forms
pinacoiddipyramidtabular crystals
Notes
RI over refractometer limit; exceptionally high dispersion; too soft and fragile for jewelry
Related Minerals
Other minerals in the tetragonal system
