doleritic

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.
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