serpentine
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Serpentine. Credit: Mineral Information Institute
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A common magnesium silicate mineral, Mg3Si2O5(OH)4, whose structure resembles that of kaolinite. There are three varieties: chrysotile (which is fibrous and the chief form of asbestos), antigorite, and lizardite. Gray, green, or yellow with an attractive texture and easily polished, serpentine is used as an ornamental stone.
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GEOLOGY AND PLANETARY SCIENCE
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