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tourmaline 音标拼音: [t'ʊrməl ,in] n. 电石 电石 tourmaline n 1: a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstonesTourmaline \ Tour" ma* line\, n. [ F. tourmaline, cf. It. turmalina, tormalina, NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon.] ( Min.) A mineral occurring usually in three- sided or six- sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline ( schorl) is the most common variety, but there are also other varieties, as the blue ( indicolite), red ( rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels. [ Written also { turmaline} .] [ 1913 Webster] Note: Crystals of tourmaline when heated exhibit electric polarity ( see { Pyroelectric}, n.). Tourmaline is also used in the form of a polariscope called tourmaline tongs. [ 1913 Webster]
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