'Dolerite' definitions:
Definition of 'Dolerite'
From: GCIDE
- Dolerite \Dol"er*ite\, n. [Gr. dolero`s deceptive, because it was easily confounded with diorite.] (Petrography) (a) A dark, crystalline, igneous rock, chiefly pyroxene with labradorite. (b) Coarse-grained basalt. (c) Diabase. (d) Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar. -- {Dol`er*it"ic}, a. [Webster 1913 Suppl.]