Scheelite

saf-ahyuh r

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.

Scheelite Polished
Scheelite Classification
Common Name Scheelite
Species Scheelite
Scheelite Optical Properties
Transparency Opaque-Transparent
Dispersion Strength: Moderate Fire Value: 0.038
Refractive Index Over The Limit 1.918-1.938 Tolerance: (+0.003/-0.003)
Birefringence 0.016- 0.017
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert to strong light blue or yellow
LWUV: Inert
Pleochroism Unobservable
Scheelite Characteristic Physical Properties
Hardness 4.5-5
Streak White
Specific Gravity 5.900-6.120 Typical:6.000
Toughness Poor
Luster SubAdamantine, Vitreous
Fracture Uneven, Subconchoidal, Irregular
Cleavage Good, in one direction, Poor, in one direction
Scheelite Chemistry & Crystallography
Chemical Name calcium tungstate
Chemical Formula CaWO4
Crystal System Tetragonal
Chemistry Classification Sulfate

Scheelite Colors

  • Yellow Scheelite Yellow
  • Colorless Scheelite Colorless
  • White Scheelite White
  • Red Scheelite Red
  • Green Scheelite Green
  • Gray Scheelite Gray
  • Brown Scheelite Brown
  • Orange Scheelite Orange

Scheelite Spectra

Scheelite Spectra
Lab Created SCHEELITE. (ω ray)

Color due to neodymium. The intense broad band in the yellow dominates the spectrum as is often the case with lab created stones doped with neodymium. When the darker ray is polarized the three lines centered at 525nm. are of equal intensity.

Scheelite Spectra
Lab Created SCHEELITE. (ε ray)

The intense broad band in the yellow dominates the spectrum as is often the case with lab created stones doped with neodymium. As the spectrum of this lighter ray is isolated by a polarizing filter, note the three lines in the green centered at about 525 nm. in which the one on the long wave side is fainter than the other two.

Scheelite Spectra
SCHEELITE. (ω ray)

Spectrum due to neodymium. The main feature in this spectrum is the group of seven lines in the yellow area between 575nm. and 595nm. which is typical of neodymium content. In some specimens two other groups may be seen, one in the green and one in the blue, but these are fewer in number, weaker, and more difficult to detect.

Scheelite Spectra
SCHEELITE. (ε ray)

Spectrum due to neodymium. The main feature in this spectrum is the group of seven lines in the yellow area between 575nm. and 595nm. which is typical of neodymium content. All the lines in the group in the yellow are seen in equal intensity without any dominant lines. In some specimens two other groups may be seen, one in the green and one in the blue, but these are fewer in number, weaker, and more difficult to detect.

Jewelry Television acknowledges the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Countries of Origin

United States of America (the); Czechia; Sri Lanka; Canada; Pakistan; Korea (the Republic of); China; Namibia; Finland; Italy; Mexico; Australia; France; Germany

Care

Gentle care, not suitable for jewelry

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Tim Matthews

Author

Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.