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Brewer's: Metamorphic Rocks

Those rocks, including gneiss, mica-schist, clay-slate, marble, and the like, which have become more or less crystalline. Source: Dictionary of Phrase and Fable, E. Cobham Brewer,…

chalcopyrite

(Encyclopedia) chalcopyrite kăl˝kəpī´rīt, kăl´kōpī˝rīt or copper pyritespīrī´tēz, pə–, brass-yellow mineral, sometimes with an iridescent tarnish. It is a sulfide of copper and iron, CuFeS2 . It…

Kuznetsk Alatau

(Encyclopedia) Kuznetsk Alatau ko͞oznyĕtsk´ əlä´tou, mountain range, S Siberian Russia, E of Novokuznetsk, rising to about 6,900 ft (2,100 m). Part of the great mountain system of central Asia, the…

rutile

(Encyclopedia) rutile, mineral, one of three forms of titanium dioxide (TiO2; see titanium). It occurs in crystals, often in twins or rosettes, and is typically brownish red, although there are black…

ilmenite

(Encyclopedia) ilmenite ĭl´mĕnīt, black mineral, iron titanium oxide, FeTiO3, crystallizing in the hexagonal system. It is sometimes found as tabular hexagonal crystals but occurs more commonly as…

spinel

(Encyclopedia) spinel, magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous rocks, in…

apatite

(Encyclopedia) apatite ăp´ətīt, mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and purple.…

magnetite

(Encyclopedia) magnetite măg´nətīt, lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (…

metamorphism

(Encyclopedia) metamorphism, in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active…