Smoky Quartz
Smoky or smokey quartz is a brown to black variety of quartz. Like other quartz gems, it is a silicon dioxide crystal. The smoky color results from free silicon, formed from the silicon dioxide by natural irradiation.
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Famous quotes containing the word smoky:
“In vain thou kindlest all thy smoky fire,
For virtue hath this better lesson taught,
Within myself to seek my only hire,
Desiring nought but how to kill desire.”
—Sir Philip Sidney (1554–1586)