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Basalt :: Basalt (n.) A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated..

Gabbro :: Gabbro (n.) A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro)..

Stamina :: Stamina (n. pl.) The fixed, firm part of a body, which supports it or gives it strength and solidity; as, the bones are the stamina of animal bodies; the ligneous parts of trees are the stamina which constitute their strength..

Plutonism :: Plutonism (n.) The theory, early advanced in geology, that the successive rocks of the earth's crust were formed by igneous fusion; -- opposed to the Neptunian theory..

Toadstone :: Toadstone (n.) A local name for the igneous rocks of Derbyshire, England; -- said by some to be derived from the German todter stein, meaning dead stone, that is, stone which contains no ores..

Woody :: Woody (a.) Consisting of, or containing, wood or woody fiber; ligneous; as, the woody parts of plants..

Plutonic :: Plutonic (a.) Of, pertaining to, or designating, the system of the Plutonists; igneous; as, the Plutonic theory..

Volcanic :: Volcanic (a.) Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa..

Dike :: Dike (n.) A wall-like mass of mineral matter, usually an intrusion of igneous rocks, filling up rents or fissures in the original strata..

Diallage :: Diallage (n.) A dark green or bronze-colored laminated variety of pyroxene, common in certain igneous rocks..

Pitchstone :: Pitchstone (n.) An igneous rock of semiglassy nature, having a luster like pitch..

Sida :: Sida (n.) A genus of malvaceous plants common in the tropics. All the species are mucilaginous, and some have tough ligneous fibers which are used as a substitute for hemp and flax..

Scintillate :: Scintillate (v. i.) To emit sparks, or fine igneous particles..

Eruptive :: Eruptive (a.) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic..

Diorite :: Diorite (n.) An igneous, crystalline in structure, consisting essentially of a triclinic feldspar and hornblende. It includes part of what was called greenstone..

Lath-shaped :: Lath-shaped (a.) Having a slender elongated form, like a lath; -- said of the feldspar of certain igneous rocks, as diabase, as seen in microscopic sections..

Pyrogenous :: Pyrogenous (a.) Produced by fire; igneous.

Scintillant :: Scintillant (a.) Emitting sparks, or fine igneous particles; sparkling..

Dolerite :: Dolerite (n.) 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..

Igneous :: Igneous (a.) Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance..

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