trachyte

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Definition of trachyte in English English dictionary: a pale igneous rock consisting mostly of potassium feldspar and plagioclase; A fine-grained, porphyritic volcanic rock, consisting mainly of alkali feldspar and minor mafic minerals; the extrusive equivalent of syenite; An igneous rock, usually light gray in color and breaking with a rough surface; A lava containing more silica than basalt; much more viscous as a result It usually weathers into a light gray color Occurs in the postshield stage in some Hawaiian volcanoes; It consists chiefly of orthoclase feldspar with sometimes hornblende and mica; Fine-grained, transitional, evolved igneous rock Mainly composed of alkali feldspar; Light-coloured, very fine-grained igneous rock composed chiefly of alkali feldspar with only minor mafic minerals (biotite, hornblende, or pyroxene). Trachyte is commonly found in volcanic regions; like many volcanic rocks, it shows a streaked or banded structure due to flowing of the congealing lava

trachyte

Hyphenation

tra·chyte

[ 'tra-"kIt, 'trA- ] (noun.) 1821. French, from Greek trachys rough.

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