peridotite

(per′ə dō′tīt′, pə rid′ə tīt′)

noun

any of several coarsegrained, dark igneous rocks consisting mainly of olivine and other ferromagnesian minerals

Origin: Fr péridotite < péridot, peridot

Related Forms:

See peridotite in American Heritage Dictionary 4

noun

Any of a group of igneous rocks composed mainly of olivine and various pyroxenes and having a granitelike texture.

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