peridotite

[per-i-doh-tahyt, puh-rid-uh-tahyt]

per·i·do·tite

[per-i-doh-tahyt, puh-rid-uh-tahyt]
noun
a coarsely granular igneous rock composed chiefly of olivine with an admixture of various other minerals.

Origin:
1895–1900; < French; see peridot, -ite1

per·i·do·tit·ic [per-i-doh-tit-ik, puh-rid-uh-] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Peridotite is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
peridotite (ˌpɛrɪˈdəʊtaɪt)
 
n
a dark coarse-grained ultrabasic plutonic igneous rock consisting principally of olivine
 
[C19: from French, from peridot]
 
peridotitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
peridotite   (pěr'ĭ-dō-tīt', pə-rĭd'ə-)  Pronunciation Key 
A coarse-grained igneous rock that consists mainly of olivine and pyroxene. It is believed to be one of the main constituent rocks of the Earth's mantle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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