Tourmalinated Quartz

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Mother Nature must have been in a whimsical, artistic mood when she created tourmalinated quartz. These crystals are usually colorless rock crystal with long, slender tourmaline inclusions, usually black in color. A relative unknown to the general public, this gem is truly a marvel! The inclusions are always one-of-a-kind, making a beautiful display in a gem collection or jewelry pieces.

Tourmalinated Quartz Polished
Tourmalinated Quartz Classification
Common Name Tourmalinated Quartz
Species Quartz
Tourmalinated Quartz Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Weak Fire Value: 0.013
Refractive Index 1.544-1.553
Tolerance:very constant
Birefringence 0.009
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None
Tourmalinated Quartz Characteristic Physical Properties
Hardness 7
Streak White
Specific Gravity 2.640-2.690 Typical:2.660
Toughness Good
Inclusions Tourmalinated quartz will contain tourmaline inclusions and may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile and iron particles.
Luster Vitreous
Stability Good
Fracture Conchoidal
Cleavage None
Tourmalinated Quartz Chemistry & Crystallography
Chemical Name silicon dioxide (aka silica)
Chemical Formula SiO2
Crystal System Trigonal
Chemistry Classification Silicate

Tourmalinated Quartz Colors

  • Black Tourmalinated Quartz Black
  • Multi-color Tourmalinated Quartz Multi-color
  • Gray Tourmalinated Quartz Gray

Alternate Names

Sagenitic Quartz

Countries of Origin

Argentina; Mozambique; Unknown; Sri Lanka; Brazil

Sisk Gemology Reference

Showcasing 200 gemstones in over 1,000 pages and accompanied by more than 2,000 photos, The Sisk Gemology Reference is a must-have in every collector’s library. Each comprehensive, three-volume set features state-of-the-art photography, detailed illustrations, and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike.

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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.