Smoky Quartz Value, Price, and Jewelry Information

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Smokey Quartz

Smoky Quartz Value

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Smoky Quartz Information

Data	Value
Name	Smoky Quartz
Is a Variety of	Quartz
Varieties	Morion
Crystallography	Hexagonal (trigonal)
Refractive Index	1.544-1.553
Colors	Every shade of brown.
Hardness	7
Wearability	Very Good
Fracture	Conchoidal to uneven
Birefringence	0.009
Cleavage	None or indistinct
Dispersion	0.013
Absorption Spectrum	Not diagnostic.
Pleochroism	Dark stones: weak brown/reddish brown. Light stones: weak, light and darker yellowish brown.
Optics	o = 1.544; e = 1.553 (very constant). Uniaxial (+).
Optic Sign	Uniaxial +
Luster	Vitreous.
Polish Luster	Vitreous.
Fracture Luster	Vitreous.
Specific Gravity	2.651
Enhancements	Heating (occasional).
Typical Treatments	Heat Treatment
Transparency	Transparent to opaque.

Comments

Smoky quartz is also mistaken for topaz. It comes in every shade of brown, from a light tan to nearly black. “Chocolate citrine” is a pleasant brownish/yellow color. Smoky quartz is known for its large sizes. The person who wants a really big gem, without a really big budget, often ends up with one of these.

Sources

Cairngorm Mountains, Scotland.
Minas Gerais, Brazil; Madagascar; Switzerland.
United States: California; North Carolina.

Stone Sizes

Smoky quartz: is in the same size league as citrine, but larger stones get very dark and opaque. Smithsonian Institution (Washington, D.C): 4500 (California) and 1695 (Brazil), plus others.