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amphibole 音标拼音: ['æmfəb ,ol] ['æmfɪb ,ol] n. 角闪石 角闪石 amphibole n 1: a mineral or mineral variety belonging to the amphibole groupAmphibole \ Am" phi* bole\ ([ a^] m" f[ i^]* b[= o] l), n. [ Gr. ' amfi` bolos doubtful, equivocal, fr. ' amfiba` llein to throw round, to doubt: cf. F. amphibole. Ha[" u] y so named the genus from the great variety of color and composition assumed by the mineral.] ( Min.) A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are { tremolite}, { actinolite}, { asbestus}, { edenite}, { hornblende} ( the last name being also used as a general term for the whole species). Amphibole is a constituent of many crystalline rocks, as syenite, diorite, most varieties of trachyte, etc. See { Hornblende}. [ 1913 Webster]
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