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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,…

Kuznetsk Alatau

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

rutile

(Encyclopedia) rutile, mineral, one of three forms of titanium dioxide (TiO 2; see titanium ). It occurs in crystals, often in twins or rosettes, and is typically brownish red,…

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,…

ilmenite

(Encyclopedia) ilmenite ĭl´mĕnīt [key], black mineral, iron titanium oxide, FeTiO 3, crystallizing in the hexagonal system. It is sometimes found as tabular hexagonal crystals but…

chalcopyrite

(Encyclopedia) chalcopyrite kăl˝kəpī´rīt, kăl´kōpī˝rīt [key] or copper pyrites pīrī´tēz, pə– [key], brass-yellow mineral, sometimes with an iridescent tarnish. It is a sulfide…

spinel

(Encyclopedia) spinel, magnesium aluminum oxide, MgAl 2O 4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous…

apatite

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

magnetite

(Encyclopedia) magnetite măg´nətīt [key], lustrous black, magnetic mineral, Fe 3O 4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the…