Dol"er*ite (?), n. [Gr. &?; deceitful; because it was easily confounded with diorite.] (Geol. & Min.)
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.
© Webster 1913
Dol"er*ite (?), n. [Gr. &?; deceptive, because 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