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:
“When the villagers were lighting their fires beyond the horizon, I too gave notice to the various wild inhabitants of Walden vale, by a smoky streamer from my chimney, that I was awake.”
—Henry David Thoreau (1817–1862)