Serpentinite is a rock composed of one or more serpentine group minerals. Minerals in this group are formed by serpentinization, a hydration and metamorphic transformation of ultramafic rock from the Earth`s mantle. The mineral alteration is particularly important at the sea floor at tectonic plate boundaries. == Formation and petrology == Serpen....
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http://en.wikipedia.org/wiki/Serpentinite
a metamorphic rock that consists largely of the mineral serpentine.
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https://www.encyclo.co.uk/local/20132
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