Originally: a variety of trachyte, containing quartz. In later use: a typically pale, fine-grained extrusive volcanic rock of granitic…
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| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > trachyte > varieties of (9) rhyolite1861 Originally: a variety of trachyte, containing quartz. In later use: a typically pale, fine-grained extrusive volcanic rock of granitic… nevadite1868 A volcanic rock, a highly porphyritic variety of rhyolite, rich in quartz phenocrysts. propylite1868 A hydrothermally altered andesite or dacite resembling greenstone, typically containing calcite, chlorite, and quartz. trachyte tuff1885 attributive, as trachyte rock, trachyte porphyry; trachyte tuff n. a tuff having the composition and structure of trachyte. ciminite1896 A name for a type of trachytic lavas (see quot. 1920). grorudite1896 (See quot. 1960.) hedrumite1896 A hypabyssal porphyritic igneous rock having a trachytic texture and consisting essentially of a potash-feldspar with small amounts of pyribole and… kenyte1900 A light red to pale brown rock consisting of olivine-bearing phonolitic trachyte. mugearite1904 A dark, fine-grained trachyte which has oligoclase as the main feldspar and also contains olivine, orthoclase, and apatite. |
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