Hypertext Webster Gateway: "dolerite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Dolerite \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.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Dolerite \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.
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