Wulfenite | Gemopedia

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.
Colors
Orange-Red, Yellow-Orange, Brown

Wulfenite Classification

Common Name

Wulfenite

Species

Wulfenite

Variety

Colors

Orange-Red, Yellow-Orange, Brown

Alternate Names

Gemstone Groups

Key Separations

OTL RI, DR nature and SG

Comments

Wulfenite is heat sensitive.

Wulfenite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

Over the Limit 2.28-2.4

Birefringence

0.12-0.122

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak yellow, orange or red
LWUV: Inert to weak red

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: strong fire Value: 0.203

Comments

Wulfenite Chemistry & Crystallography

Chemical Name

lead molybdate

Chemical Formula

PbMoO4

Synthesis

Crystal System

Tetragonal

Classification

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Wulfenite Characteristic Physical Properties

Hardness

3

Streak

White

Specific Gravity

6.5-7

Toughness

Poor

Inclusions

Luster

Adamantine

Stability

Fracture

Uneven, Subconchoidal

Cleavage

Good, in one direction, Poor, in two directions

Comments

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