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 (pĕr′ĭ-dō-tīt′, pə-rĭd′ə-)
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]
peridotitic adj


(ˈpɛr ɪˌdoʊ taɪt, pəˈrɪd əˌtaɪt)

a coarsely granular igneous rock composed chiefly of olivine admixed with various other minerals.
[1895–1900; < French; see peridot, -ite1]
per`i•do•tit′ic (-ˈtɪt ɪk) adj.


A coarse-grained igneous rock, mainly of olivine and pyroxene, such as dunite.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.peridotite - a dark coarse-grained igneous rock consisting principally of olivine
igneous rock - rock formed by the solidification of molten magma
kimberlite - a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia
References in periodicals archive ?
"18-Feb-97 (C Salo) - Disseminated, blebby, veinlet controlled, and massive magnetite, pyrrhotite, and chalcopyrite mineralization occurs within the variably sheared and serpentinized peridotitic base of the discordant ultramafic body which hosts the serpentine industrial filler mineralization of the Hedman Mine (described in the report for the Hedman Mine).
Finally, the middle crust is granodioritic, the lower crust is felsic granulitic, and the mantle is peridotitic.
Galatella malacitana (Asteraceae): a new species from the peridotitic mountains of southern Spain.
Under these conditions, the derived melts may form, dissolving most of the "volatile" phases and, percolating through a porous and deformed rock matrix, invadedthe base of thelithosphere andfavouredmetasomatic processes at different levels in the peridotitic lithosphere with the formation of amphibole and/or phlogopite ("veined mantle" of [82, 83]).
Nickel and cobalt are found here on the surface, blended in a lateritic weathering crust formed over serpentines and peridotitic rocks, which for millions of years were exposed to hot and humid tropical weather in mesa-like low mountains and coastal hills.
The inclusions in diamonds come in two major varieties: peridotitic and eclogitic.