dolerite

[dol-uh-rahyt]
noun Petrology.
1.
a coarse-grained variety of basalt.
2.
any of various other igneous rocks, as diabase.
3.
any basaltlike igneous rock whose composition can be determined only by microscopic examination.

Origin:
1830–40; < French dolérite < Greek doler(ós) deceitful (derivative of dólos wile) + French -ite -ite1

doleritic [dol-uh-rit-ik] , adjective
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World English Dictionary
dolerite (ˈdɒləˌraɪt)
 
n
1.  a dark basic intrusive igneous rock consisting of plagioclase feldspar and a pyroxene, such as augite; often emplaced in dykes
2.  any dark igneous rock whose composition cannot be determined with the naked eye
 
[C19: from French dolérite, from Greek doleros deceitful; so called because of the difficulty of determining its composition]
 
doleritic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dolerite   (dŏl'ə-rīt')  Pronunciation Key 
See diabase.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Desert sands of this region have taken on the deep, dark color of eroded volcanic layers of dolerite.
The belt is underlain by gabbro, aluminous dolerite, and sedimentary rocks.
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