noun[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.
- 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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