PERIDOTITE

peridotite

(noun) a dark coarse-grained igneous rock consisting principally of olivine

Source: WordNet® 3.1

Etymology

Noun

peridotite (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.

Source: Wiktionary

Per"i*do*tite, n. Etym: [Cf. F. péridotite.] (Min.)

Definition: An eruptive rock characterized by the presence of chrysolite (peridot). It also usually contains pyroxene, enstatite, chromite, etc. It is often altered to serpentine.

Note: The chief diamond deposits in South Africa occur in a more or less altered peridotite.

Source: Webster’s Unabridged Dictionary 1913 Edition

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