pe·ri·do·tite /pəˈrɪdəˌtaɪt/
  橄欖岩
  Per·i·do·tite n.  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.
  Note: ☞ The chief diamond deposits in South Africa occur in a more or less altered peridotite.
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  peridotite
       n : a dark coarse-grained igneous rock consisting principally of
           olivine