smoky quartz


smoky quartz
a smoky-yellow to dark brown or black variety of quartz, used as a gem. Also called cairngorm, Cairngorm stone.
[1830-40]

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Common, coarse-grained variety of quartz that ranges in colour from nearly black through smoky brown.

No distinct boundary exists between smoky and colourless quartz. Its abundance causes it to be worth considerably less than either amethyst or citrine. Heating bleaches the stone, the colour sometimes passing through yellow; these yellow pieces are often sold as citrine.

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      very common, coarse-grained variety of the silica mineral quartz (q.v.) that ranges in colour from nearly black through smoky brown. No distinct boundary exists between smoky and colourless quartz. Its abundance causes it to be worth considerably less than either amethyst or citrine. Heating bleaches the stone, the colour sometimes passing through yellow; these yellow pieces are often sold as citrine. Crystals of the mineral frequently contain inclusions of gas (carbon dioxide), liquid (often both water and liquid carbon dioxide), or solids (rutile). Smoky quartz from Mount Cairngorm, Scotland, is known as cairngorm and is a favourite ornamental stone in Scotland, where it is worn in brooches with Highland costume. Its properties are those of quartz. See silica mineral (table).

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Universalium. 2010.

Look at other dictionaries:

  • Smoky quartz — Smoky or smokey quartz is a brown to black variety of quartz.[1] Like other quartz gems, it is a silicon dioxide crystal. The smoky colour results from free silicon, formed from the silicon dioxide by natural irradiation …   Wikipedia

  • Smoky quartz — Smoky Smok y, a. [Compar. {Smokier}; superl. {Smokiest}.] 1. Emitting smoke, esp. in large quantities or in an offensive manner; fumid; as, smoky fires. [1913 Webster] 2. Having the appearance or nature of smoke; as, a smoky fog. Unlustrous as… …   The Collaborative International Dictionary of English

  • smoky quartz — n. CAIRNGORM …   English World dictionary

  • smoky quartz — smok′y quartz′ n. mir jew a smoky yellow to dark brown or black variety of quartz, used as a gem • Etymology: 1830–40 …   From formal English to slang

  • smoky quartz — noun a smoky yellow or brown quartz • Syn: ↑cairngorm • Hypernyms: ↑quartz …   Useful english dictionary

  • smoky quartz — noun A brown to black variety of quartz …   Wiktionary

  • smoky quartz — noun a semi precious variety of quartz ranging in colour from light greyish brown to nearly black …   English new terms dictionary

  • smoky quartz — noun Date: 1837 cairngorm …   New Collegiate Dictionary

  • Smoky — Smok y, a. [Compar. {Smokier}; superl. {Smokiest}.] 1. Emitting smoke, esp. in large quantities or in an offensive manner; fumid; as, smoky fires. [1913 Webster] 2. Having the appearance or nature of smoke; as, a smoky fog. Unlustrous as the… …   The Collaborative International Dictionary of English

  • Quartz — Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in… …   The Collaborative International Dictionary of English


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