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Quartzite is a metamorphic rock formed when sandstone (made up of tiny grains of quartz) is subjected to heat and pressure under Earths surface, fusing the sand grains together. The result is an extremely durable rock that can also be dyed to attractive colors.

Quartzite Polished
Quartzite Classification
Common Name Quartzite
Species Quartzite
Quartzite Optical Properties
Transparency Translucent - Opaque
Dispersion Strength: None
Refractive Index 1.544-1.553
Tolerance:very constant
Birefringence 0.009
Optic Character NA
Optic Sign NA
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None
Quartzite Characteristic Physical Properties
Hardness 7
Streak White
Specific Gravity 2.640-2.690 Typical:2.660
Toughness Good
Inclusions Quartzite is an aggregate of tightly packed quartz grains.
Luster Dull, Vitreous
Stability Good
Fracture Conchoidal, Granular
Cleavage None
Quartzite Chemistry & Crystallography
Chemical Name silicon dioxide (aka silica)
Chemical Formula SiO2
Crystal System Trigonal
Chemistry Classification Rock

Quartzite Colors

  • Multi-color Quartzite Multi-color
  • Yellow Quartzite Yellow
  • White Quartzite White
  • Red Quartzite Red
  • Purple Quartzite Purple
  • Pink Quartzite Pink
  • Orange Quartzite Orange
  • Green Quartzite Green
  • Gray Quartzite Gray
  • Brown Quartzite Brown
  • Blue Quartzite Blue
  • Black Quartzite Black

Quartzite Spectra

Quartzite Spectra

Color may be due to chromium or nickel salts. A colorless quartzite is dyed to simulate the green aventurine. The single vague narrow line at 630nm. and little transmission beyond 630nm. suggests the color here is due to nickel

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

Canada; Colombia; Argentina; China; Brazil; Mexico; Peru; India


Normal care for untreated stones. Avoid harsh chemicals, ultrasonic cleaners, and steaming for dyed and impregnated stones.

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Tim Matthews


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.