Serpentine
Christopher Middleton
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Serpentine

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Serpentine: A mineral or rock consisting of a hydrous magnesium silicate, H4 M3 Si2 O9, and having usually a dull green color, often with a spotted or mottled appearance, resembling a serpent's skin. It occurs usually in masses, which are sometimes foliated, sometimes fibrous … Presence of iron may give it a red or brownish hue. Precious, or noble, serpentine is translucent & of a rich oil-green color. Serpentine results from the alteration of other magnesian minerals, esp. chrysolite, amphibole, & pyroxene, and is frequently found in large masses … -Webster's, 1914; from a note preserved ...