Wulfenite

saf-ahyuh r

Known for its striking orange, yellow and red hues, nice luster and unique crystal habits, wulfenite is a lead molybdate that is found in the oxidation zone of lead-ore deposits. Wulfenite typically forms thin, tabular crystals and therefore, acquiring a crystal thick enough to fashion into a gem is challenging. In addition, great care must be taken during the faceting process because wulfenite is a delicate mineral.

Wulfenite Polished
Wulfenite Classification
Common Name Wulfenite
Species Wulfenite
Wulfenite Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Strong Fire Value: 0.203
Refractive Index Over The Limit 2.280-2.400
Birefringence 0.12-0.122
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert to weak yellow, orange or red
LWUV: Inert to weak red
Pleochroism Unobservable
Wulfenite Characteristic Physical Properties
Hardness 3
Streak White
Specific Gravity 6.500-7.000
Toughness Poor
Luster Adamantine, Resinous
Fracture Uneven, Subconchoidal
Cleavage Good, in one direction, Poor, in two directions
Wulfenite Chemistry & Crystallography
Chemical Name lead molybdate
Chemical Formula PbMoO4
Crystal System Tetragonal

Wulfenite Colors

  • Brown Wulfenite Brown
  • Orange Wulfenite Orange

Countries of Origin

United States of America (the); Namibia; Mexico

Care

Very soft , careful handling

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This page was created on June 27, 2014.

This page was last edited on October 24, 2019.