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Peridotite

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A peridotite is an ultramafic rock containing more than 40% olivine (Mg2SiO4).

A general term for a coarse-grained plutonic rock composed chiefly of olivine with or without other mafic minerals such as pyroxenes, amphiboles, or micas, and containing little or no feldspar. Accessory minerals of the spinel group are commonly present. Peridotite is commonly altered to serpentinite.

Ref: AGI


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Classification of PeridotiteHide

Modal classification of ultramafic rocks (after Streckeisen, 1973)

Sub-divisions of PeridotiteHide

Mineralogy of PeridotiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
ChromiteFe2+Cr3+2O4
PyroxeneA petrological term for Pyroxene Group.

Other Language Names for PeridotiteHide

German:Peridotit

References for PeridotiteHide

Reference List:
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Danckwerth, P.A. and Newton, R.C. (1978) Experimental determination of the spinel peridotite to garnet peridotite reaction in the system MgO-Al2O3-SiO2 in the range 900–1100° C and Al2O3 isopleths of enstatite in the spinel field. Contributions to Mineralogy and Petrology: 66: 189–201.
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press.

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