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Peridotite

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Peridotites are an ultramafic rock containing more than 40% olivine.


Classification of Peridotite

Modal classification of ultramafic rocks (after Streckeisen, 1973)

Sub-divisions of Peridotite

Mineralogy of Peridotite

Essential minerals - these are minerals that are required within the classification of this rock:
Olivine(Mg,Fe2+)2SiO4
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
PyroxeneA petrological term for Pyroxene Group.
Accessory minerals - these are minor components, often far less than 1% of the total mineral material:
ChromiteFe2+Cr23+O4

References for Peridotite

Reference List:
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for Peridotite

mindat.org URL:
https://www.mindat.org/min-48407.html
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