Dolerite
Pronunciation : Dol"er*ite
Part of Speech : n.
Etymology : [Gr. (Geol. & Min.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913