Scheelite | Gemopedia

Scheelite, named for Swedish chemist C.W. Scheele is a calcium tungstate, a major source of tungsten. Most scheelite is fluorescent and ranges from blue to white in color. Spectacular, transparent crystals come from Austria, Italy, Brazil, Rwanda, and Colorado. Scheelite crystals often have high luster and fire that is almost adamantine.
Colors
Colorless, Yellow, Orange, Brown

Scheelite Classification

Common Name

Scheelite

Species

Scheelite

Variety

Colors

Colorless, Yellow, Orange, Brown

Alternate Names

Gemstone Groups

Key Separations

Moderate dispersion, strong fluorescence to SW and high SG

Comments

Thermoluminescent: phosphorescence caused by heating

Scheelite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

Over The Limit 1.918-1.934
Tolerance:(+0.003/-0.003)

Birefringence

0.016

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to strong light blue or yellow
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: moderate fire Value: 0.038

Comments

Scheelite Chemistry & Crystallography

Chemical Name

calcium tungstate

Chemical Formula

CaWO4

Synthesis

Crystal System

Tetragonal

Classification

Sulfate

Nature

Natural

Crystallinity

Crystalline

Comments

Scheelite Characteristic Physical Properties

Hardness

4.5-5

Streak

White

Specific Gravity

5.9-6.12 Typical:6

Toughness

Poor

Inclusions

Luster

SubAdamantine

Stability

Fracture

Uneven, Subconchoidal

Cleavage

Good, in one direction, Poor, in one direction

Comments

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