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countable and uncountable, plural peridotites
(geology) A rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the Earth's mantle. quotations
Varieties of peridotite are distinguished by their mineral composition; for example, dunite is a peridotite which is virtually all olivine, and a dense, dark green in colour.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 60