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peridotite
CIDE DICTIONARY
peridotite, n. [Cf. F. péridotite.].
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]
" The chief diamond deposits in South Africa occur in a more or less altered peridotite." [1913 Webster]
For further exploring for "peridotite" in Webster Dictionary Online