Dolerite

·add. ·noun Coarse-grained basalt.

II. Dolerite ·add. ·noun Diabase.

III. Dolerite ·add. ·noun A dark, crystalline, igneous rock, chiefly pyroxene with labradorite.

IV. Dolerite ·add. ·noun Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.

V. Dolerite ·noun A dark-colored, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt.