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n. Chiefly British
A dark, fine-grained igneous rock; diabase.

[French dolérite, from Greek doleros, deceitful (from its easily being mistaken for diorite), from dolos, trick; see del- in Indo-European roots.]

dol′er·it′ic (ə-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.
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References in periodicals archive ?
The dolerites are texturally basaltic, doleritic and gabbroic and are altered compare to lamprophyres.
Two series of volcanic rocks, one andesitic the other doleritic (which would now be termed basalts), were also noted.
The results of petrographic studies indicate that the rocks are mostly of doleritic to dioritic compositions characterized by vein and cavity fillings of calcite.
The area is underlain by sedimentary rocks of the Tarkastad subgroup and Beaufort karoo supergroup with post-karoo doleritic intrusions [18, 19].
(2003) record saponite as the main phyllosilicate in the contact between the marl-limestone rhythmite and doleritic laccolith of Sierra de Priego (Cordoba), as a consequence of a late hydrothermal process after contact metamorphism produced by the intrusion of subvolcanic rocks.
Besides, the presence of ubiquitous intrusive bodies that are either doleritic or gabbroic has been delineated in the Bornu Basin by Carter et al.
The moderate bulk densities can be attributed to a combination of relatively high organic matter content in the doleritic soils, low use of machinery and slash retention and scattering on the harvested forest sites.
Basalt-hosted mineralisation is found within the basaltic and doleritic rocks around the 1974 discovery area.
Samples of outcropping granite and dolerite and of granitic and doleritic saprolite were collected from Jarrahdale railway cutting (30 km north of the Huntly mine).