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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 ?
The formation of Py dikes and veins can be attributed to the metasomatism of mantle peridotite by melt or fluid migration resultant from the subducted slab.
This descends from the northern slopes of the Tablelands to flow across Trout River Gulch over a prominent alluvial fan composed almost entirely of coarse peridotite rubble material (Fig.
The MMEs and dykes show low Ni (4-14 ppm and 4753 ppm, respectively) and Cr (mostly < 30 ppm and 190-200 ppm) values, which are lower than the Ni-Cr concentrations (Ni = 250-300 ppm, Cr = 500-600 ppm) expected for a primitive basaltic magma derived from a mantle peridotite source (e.
When it encounters a type of rock in Earth's mantle called peridotite, it reacts with minerals in peridotite and generates hydrogen, methane, and other gases.
com Sobhi Nasir, the lead scientist and director of Earth Sciences Research Centre at the SQU, says when the peridotite rock comes in contact with water, it reacts with the carbon dioxide and converts the gas into a solid mineral.
Summary: When peridotite rock reacts with carbon dioxide it converts gas into solid
2012): Crystal-plastic deformation and recrystallization of peridotite controlled by the seismic cycle.
Some of the fluids, those in equilibrium with mantle peridotite minerals, contained the expected carbon dioxide and methane.
Herrera LK, Arroyavea C, Guiametb P, Gomez de Saravia S, Videla H (2004) Biodeterioration of peridotite and other constructional materials in a building of the Colombian cultural heritage.
The drilling also indicated that sulphides are regularly present in altered peridotite and pyroxenite gneisses underlying the mineralized laterite.