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Trap :: Trap (n.) An old term rather loosely used to designate various dark-colored, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc., but including also some kinds of diorite. Called also trap rock..

Melilite :: Melilite (n.) A mineral occurring in small yellow crystals, found in the lavas (melilite basalt) of Vesuvius, and elsewhere..

Zeolite :: Zeolite (n.) A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta. Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others. These species occur of secondary origin in the cavities of amygdaloid, basalt, and lava, also, less frequently, in granite and gneiss. So called because many of these species intumesce before the blowpipe..

Melaphyre :: Melaphyre (n.) Any one of several dark-colored augitic, eruptive rocks allied to basalt..

Gtraystone :: Gtraystone (n.) A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt..

Basalt :: Basalt (n.) An imitation, in pottery, of natural basalt; a kind of black porcelain..

Basaltoid :: Basaltoid (a.) Formed like basalt; basaltiform.

Crustated :: Crustated (a.) Covered with a crust; as, crustated basalt..

Amygdaloid :: Amygdaloid (n.) A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava..

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..

Basaltic :: Basaltic (a.) Pertaining to basalt; formed of, or containing, basalt; as basaltic lava..

Augite :: Augite (n.) A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene..

Wacky :: Wacky (n.) A soft, earthy, dark-colored rock or clay derived from the alteration of basalt..

Tachylyte :: Tachylyte (n.) A vitreous form of basalt; -- so called because decomposable by acids and readily fusible.

Basic :: Basic (a.) Said of crystalline rocks which contain a relatively low percentage of silica, as basalt..

Whinstone :: Whinstone (n.) A provincial name given in England to basaltic rocks, and applied by miners to other kind of dark-colored unstratified rocks which resist the point of the pick. -- for example, to masses of chert. Whin-dikes, and whin-sills, are names sometimes given to veins or beds of basalt..

Basaltiform :: Basaltiform (a.) In the form of basalt; columnar.

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..

Igneous :: Igneous (a.) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks..

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