cummingtonite

(kŭm`ĭngtənīt): see amphiboleamphibole
, any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements.
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Cummingtonite

a mineral from the series of monoclinic amphiboles. The chemical composition is (Mg, Fe)7[Si₄O₁₁]2 (OH)₂; admixtures of Ca, Al, Mn, and Na are common. The Mg-rich members are called cupfferite; the more ferruginous ones are called griinerite. Cummingtonite forms fibrous aggregates or radiating, columnar masses of brownish gray to dark brown color. It has a hardness of 5.5–6 on the mineralogical scale; its density ranges from 3,100 to 3,600 kg/m³. Cummingtonite is a characteristic mineral of metamorphic schists. It is also encountered in contact-metasomatic skarns and metamorphogenetic ore deposits.

cummingtonite

[′kəm·iŋ·tə‚nīt] (mineralogy) (Fe,Mg)₇Si₈O₂₂(OH)₂ A brownish mineral that crystallizes in the monoclinic system; usually occurs as lamellae or fibers in metamorphic rocks.

单词	cummingtonite
释义	cummingtonite cummingtonite (ˈkʌmɪŋtəˌnaɪt) nan amphibole mineral, magnesium iron silicate hydroxide, found in metamorphic rocks cummingtonite cummingtonite (kŭm`ĭngtənīt): see amphiboleamphibole , any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements. ..... Click the link for more information. . Cummingtonite a mineral from the series of monoclinic amphiboles. The chemical composition is (Mg, Fe)7[Si₄O₁₁]2 (OH)₂; admixtures of Ca, Al, Mn, and Na are common. The Mg-rich members are called cupfferite; the more ferruginous ones are called griinerite. Cummingtonite forms fibrous aggregates or radiating, columnar masses of brownish gray to dark brown color. It has a hardness of 5.5–6 on the mineralogical scale; its density ranges from 3,100 to 3,600 kg/m³. Cummingtonite is a characteristic mineral of metamorphic schists. It is also encountered in contact-metasomatic skarns and metamorphogenetic ore deposits. cummingtonite [′kəm·iŋ·tə‚nīt] (mineralogy) (Fe,Mg)₇Si₈O₂₂(OH)₂ A brownish mineral that crystallizes in the monoclinic system; usually occurs as lamellae or fibers in metamorphic rocks.
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