a smoky-yellow to dark brown or black variety of quartz, used as a gem
Also called: cairngorm, Cairngorm stone
Word origin
[1830–40]This word is first recorded in the period 1830–40. Other words that entered Englishat around the same time include: baby talk, format, grid, nationalism, stroboscope
Examples of 'smoky quartz' in a sentence
smoky quartz
Sodium (low mobility) and hydrogen (high mobility) should make smoky quartz colorless after heat-treatment.
Eduardo Henrique Martins Nunes, Fernando Soares Lameiras 2005, 'The optical absorption of gamma irradiated and heat-treated natural quartz', Materials Researchhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300014. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
By heat-treatment, smoky quartz may become successively greenish, yellowish, or brownishas the irradiation dose increases.
Eduardo Henrique Martins Nunes, Fernando Soares Lameiras 2005, 'The optical absorption of gamma irradiated and heat-treated natural quartz', Materials Researchhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300014. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)