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Smoky Quartz

Quartz

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Smoky Quartz Polished Smoky Quartz Rough Smoky Quartz Jewelry
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Table of Contents
  • General Information
  • Smoky Quartz Colors
  • Alternate Names
  • Countries of Origin
  • History
  • More About Smoky Quartz

Smoky quartz is a variety of quartz that is brown to brownish black. The color is created by exposure to natural or artificial gamma rays.  Morion is the name applied to a nearly black variety of smoky quartz that is semitranslucent or opaque. Most faceted smoky quartz comes from Brazil, but fine mineral specimens can be found from around the world.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Smoky Quartz
Species
Quartz
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
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
Chemical Name
silicon dioxide (aka silica)
Chemical Formula
SiO2
Crystal System
Trigonal
Chemistry Classification
Silicate

Smoky Quartz Colors

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

History

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.

Smoky Quartz Gemstone

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.

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