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[per-i-doh-tahyt, puh-rid-uh-tahyt] /ˈpɛr ɪˌdoʊ taɪt, pəˈrɪd əˌtaɪt/

a coarsely granular igneous rock composed chiefly of olivine with an admixture of various other minerals.
a dark coarse-grained ultrabasic plutonic igneous rock consisting principally of olivine
(pěr’ĭ-dō-tīt’, pə-rĭd’ə-)
A coarse-grained igneous rock that consists mainly of olivine and pyroxene. It is believed to be one of the main constituent rocks of the Earth’s mantle.


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