Smoky Quartz

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Smoky quartz is an earth-toned transparent quartz that comes in a variety of shades, including cognac. Smoky quartz gets its rich warm colors from color centers when aluminum replaces silica in the crystal lattice of the quartz after exposure to gamma rays. A popular ornamental stone, it is often carved into figurines and ornate statues, but makes quite a statement when faceted into stunning gemstones.

Smoky Quartz Polished
Smoky Quartz Classification
Common Name Smoky Quartz
Species Quartz
Smoky Quartz Optical Properties
Transparency Opaque-Transparent
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 Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Dichroic, unobservable or weak, varying shades of body color
Smoky Quartz Characteristic Physical Properties
Hardness 7
Streak White
Specific Gravity 2.640-2.690 Range:0.03/-0.02 Typical:2.660
Toughness Good
Inclusions Smoky quartz is a type II clarity stone. Color zoning often present in stones in the form of "tiger stripes" or "zebra stripes". Stones may contain crystals, negative crystals, liquid inclusions, two-phase inclusions and partially-healed fractures.
Luster Vitreous
Stability Good
Fracture Conchoidal
Cleavage None
Smoky Quartz Chemistry & Crystallography
Chemical Name silicon dioxide (aka silica)
Chemical Formula SiO2
Crystal System Trigonal
Chemistry Classification Silicate

Smoky Quartz Colors

  • Brown Smoky Quartz Brown

Alternate Names

Cairngorm If Dark Brown Or Morion If Nearly Opaque Black, Mandiore Dorado Quartz(TM), Champagne Quartz, Latte Quartz, Whiskey Quartz

Countries of Origin

United States of America (the); Madagascar; Thailand; Switzerland; Bolivia (Plurinational State of); India; Mozambique; Pakistan; Unknown; China; Namibia; Brazil; South Africa; Peru; Germany; United Kingdom of Great Britain and Northern Ireland (the)


Rich, warm, clear... smoky quartz is a stone you'll appreciate for its coffee-color and earthy appeal. As with other members of the quartz family, this stone is usually extremely clear, so light can enter it and dance out again. Set smoky quartz in yellow metals or rose-toned metals or white metals... wherever it goes, it's a delicious delight.

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More About Smoky Quartz

Smoky quartz is the national gemstone of Scotland. The source found in the Scottish Highlands is called Cairngorm. According to folklore, quartz is a stone credited with the ability to attract positive things like love. It's also credited with the ability to help one achieve inner peace. We can see that. It's a peaceful sort of stone.

Smoky Quartz Gemstone

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.