Smoky Quartz | Gemopedia

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 related to aluminum. A popular ornamental stone, it is often carved into figurines and ornate statues, but makes quite a statement when faceted into stunning gemstones.
Alternate
Names
Cairngorm If Dark Brown Or Morion If Nearly Opaque Black, Mandiore Dorado Quartz(TM), Champagne Quartz, Latte Quartz, Whiskey Quartz
Colors
Brown, Beige, Pale Tan, Reddish Brown, Gray, Dark Brown Almost Black

Smoky Quartz Classification

Common Name

Smoky Quartz

Species

Quartz

Variety

Smoky Quartz

Colors

Brown, Beige, Pale Tan, Reddish Brown, Gray, Dark Brown Almost Black

Alternate Names

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

Gemstone Groups

Key Separations

refractive index, birefringence, optic character and optic figure. Careful observation that reveals Brazil-law twinning separates citrine from scapolite with similar properties.

Comments

Smoky quartz is the common variety name for transparent quartz with a predominantly brown color with low color saturation. The brown color is due to irradiation and it can be natural or induced by by man. Misnomers: smoky topaz, burnt topaz, Scotch topaz.

Smoky Quartz Optical Properties

Transparency

Transparent

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

CCF Reaction

Pleochroism

Dichroic, unobservable or weak, varying shades of body color

Dispersion

Strength: weak fire Value: 0.013

Comments

Smoky Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Smoky Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Range:0.03/-0.02 Typical:2.66

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

Comments

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