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Any of various dark, granite-textured, crystalline rocks rich in plagioclase feldspar and having little quartz.

[French, from Greek diorizein, to distinguish : dia-, apart, between; see dia- + horizein, to divide, limit; see horizon.]

di′o·rit′ic (-rĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) a dark coarse-grained igneous plutonic rock consisting of plagioclase feldspar and ferromagnesian minerals such as hornblende
[C19: from French, from Greek diorizein to distinguish (from dia- apart + horizein to define) + -ite1]
dioritic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdaɪ əˌraɪt)

a granular igneous rock consisting essentially of plagioclase feldspar and hornblende.
[1820–30; < French < Greek dior(ízein) to distinguish]
di`o•rit′ic (-ˈrɪt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


A coarse-textured igneous rock, mainly comprising feldspar and pyroxene.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diorite - a granular crystalline intrusive rockdiorite - a granular crystalline intrusive rock
igneous rock - rock formed by the solidification of molten magma
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Mineralogy and geochemistry of diorites and associated hydrothermal sulfide mineralization of Gawuch Formation in Drosh area, Chitral, northern Pakistan.
The alteration halos are composed of chlorite [+ or -] calcite [+ or -] epidote, in the diorites and quartz diorites of Segovia batholith and of muscovite [+ or -] illite + quartz + pyrite in the black shales of Segovia sedimentary rocks.
This mineral is formed in granites, sinites and diorites with hornblende and also in low temperature vein rocks of the Alpes type and it is the result of releasing titan in these rocks [3].
Maria Jose is located in the Department of Ancash and the project includes Cretaceous to Paleocene diorites and granitoids of the Coastal Batholith.
Preliminary follow-up of the gold in soil anomaly in the Northeast target discussed in the March 3, 2011 press release has outlined an area of strongly sheared diorites with narrow quartz-magnetite stringers and minor pyrite.
A 150 metre mineralised strike length has now been outlined at Undaunted and the deposit remains open at depth, with tightly folded mineralised diorites in the area showing strong similarities to Focus' Countess underground operation nearby.
The Aguablanca stock is a small body in the northern part of the Main Santa Olalla Pluton and consists of cumulates, mainly gabbro and norite with intercalations of pyroxenite and peridotite, that grade into amphibole-biotite diorites in the core.
Some of these magnetic highs are coincident with magnetic intrusive rocks, locally mapped as gabbros and diorites, along the coastline and immediately north of the Salave granodiorite, which hosts the Salave Deposit.
The Chilas complex in the Kiner Gah area comprises gabbronorites, kyanite-garnet bearing tonalites, pyroxene quartz diorites, granites and amphibolites.