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Any of various coarse-grained igneous rocks that consist mainly of olivine and pyroxene and are believed to be a main constituent of the earth's mantle.
(Minerals) a dark coarse-grained ultrabasic plutonic igneous rock consisting principally of olivine
[C19: from French, from peridot]
per•i•do•tite(ˈpɛr ɪˌdoʊ taɪt, pəˈrɪd əˌtaɪt)
a coarsely granular igneous rock composed chiefly of olivine admixed with various other minerals.
per`i•do•tit′ic (-ˈtɪt ɪk) adj.
A coarse-grained igneous rock, mainly of olivine and pyroxene, such as dunite.