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peridotite n. 橄榄岩 橄榄岩 peridotite n 1: a dark coarse-grained igneous rock consisting principally of olivine Peridotite \Per"i*do*tite\, n. [Cf. F. p['e]ridotite.] (Min.)
An eruptive rock characterized by the presence of chrysolite (peridot). It also usually contains pyroxene, enstatite, chromite, etc. It is often altered to serpentine. [1913 Webster] Note: The chief diamond deposits in South Africa occur in a more or less altered peridotite. [1913 Webster]
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