Definition of dolerite in English:


Line breaks: doler|ite
Pronunciation: /ˈdɒlərʌɪt


[mass noun] Geology
  • A dark, medium-grained igneous rock, typically with ophitic texture, containing plagioclase, pyroxene, and olivine. It typically occurs in dykes and sills. Also called diabase.
    More example sentences
    • These supracrustal rocks are intruded by dolerite dykes that have been deformed and metamorphosed together with the country rock.
    • We reached Fault Bluff, a dark angular mountain with faulted dolerite rock, around 10: 00 P.M. that night.
    • Neither had iron tools and instead used such hard stones as flint, jade, dolerite, basalt, and serpentine to make axes, knives, and chisels.


mid 19th century: from French dolérite, from Greek doleros 'deceptive' (because it is difficult to distinguish from diorite).

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