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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Word of the Day
22 April 2025
BRIGHT
(adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow; “bright silver candlesticks”; “a burnished brass knocker”; “she brushed her hair until it fell in lustrous auburn waves”; “rows of shining glasses”; “shiny black patents”
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