add. ·noun coarse-grained basalt.
2. dolerite ·add. ·noun diabase.
3. dolerite ·add. ·noun a dark, crystalline, igneous rock, chiefly pyroxene with labradorite.
4. dolerite ·add. ·noun any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.
5. 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.