smoky quartz

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Related to Cairngormstone: smoky topaz

smoky quartz

[′smōk·ē ′kwȯrts]
(mineralogy)
A smoky-yellow, smoky-brown, or brownish-gray, often transparent variety of crystalline quartz containing inclusions of carbon dioxide; may be used as a semiprecious stone. Also known as cairngorm; smokestone.