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diorite

[dahy-uh-rahyt] /ˈdaɪ əˌraɪt/
noun
1.
a granular igneous rock consisting essentially of plagioclase feldspar and hornblende.
Origin
1820-1830
1820-30; < French < Greek dior(ízein) to distinguish (see di-3, horizon) + French -ite -ite1
Related forms
dioritic
[dahy-uh-rit-ik] /ˌdaɪ əˈrɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for diorite
  • Hornblende gabbro locally intrudes and is mapped with the diorite.
  • diorite exposed here is a dark-colored, fine- to medium-grained hornblende diorite.
British Dictionary definitions for diorite

diorite

/ˈdaɪəˌraɪt/
noun
1.
a dark coarse-grained igneous plutonic rock consisting of plagioclase feldspar and ferromagnesian minerals such as hornblende
Derived Forms
dioritic (ˌdaɪəˈrɪtɪk) adjective
Word Origin
C19: from French, from Greek diorizein to distinguish (from dia- apart + horizein to define) + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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diorite in Science
diorite
  (dī'ə-rīt')   
A gray, coarse-grained plutonic rock. Diorite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It is the coarse-grained equivalent of andesite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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