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Dolerite (Geology Glossary)

Dolerite : 1.  A basic igneous rock of medium grain size, occurring as minor intrusions or in the central parts of thick lava flows.2.  A dark-coloured, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. Considered by some authors to be equivalent to a coarse-grained basalt.3.  A dark, crystalline, igneous rock, chiefly pyroxene with labradorite.4.  Coarse-grained basalt.5.  Diabase.6.  Any dark igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.

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