英语词汇“trachyte”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	trachyte
释义	trachyte enUK tra·chyte T0300200 (trā′kīt′, trăk′īt′)n. A light-colored igneous rock consisting essentially of alkali feldspar. [French, from Greek trākhus, rough.] tra·chyt′ic (trə-kĭt′ĭk) adj. trachyte (ˈtreɪkaɪt; ˈtræ-) n (Geological Science) a light-coloured fine-grained volcanic rock of rough texture consisting of feldspars with small amounts of pyroxene or amphibole[C19: from French, from Greek trakhutēs, from trakhus rough] trachytoid adj tra•chyte (ˈtreɪ kaɪt, ˈtræk aɪt) n. a fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite. [1815–25; < French < Greek trāchýtēs roughness =trāchý(s) rough + -tēs n. suffix] tra•chyt•ic (trəˈkɪt ɪk) trach•y•toid (ˈtræk ɪˌtɔɪd, ˈtreɪ kɪ-) adj. Trachyte enUK trachyte [′tra‚kīt] (petrology) The light-colored, aphanitic rock (the volcanic equivalent of syenite), composed largely of alkali feldspar with minor amounts of mafic minerals. Trachyte a cenotypal extrusive, usually porphyritic rock. Porphyritic phenocrysts and microlites embedded in volcanic glass are represented by sanidine; neutral and acid plagioclase, biotite, pyroxene, or amphibole are encountered in lesser amounts. Trachyte is the extrusive equivalent of syenite. It consists of up to 60 percent silica and up to 10 percent alkalies. The rock is rough to the touch. There are glassy trachytes, such as obsidians and pumices, and trachytic tuffs. Trachytes grade into liparites, andesites, and basalts. They are found in the Caucasus and, outside the USSR, in Italy and France. Trachyte is a relatively rare rock. (See also.)
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更新时间：2024/12/23 22:02:37