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Trachyte

Trachyte is an igneous, volcanic (extrusive) rock, with aphanitic to porphyritic texture. Mineral assembly is usually, alkali feldspar and plagioclase (in a ratio > 1:4). Quartz is absent. Biotite, pyroxene and scarce olivine are common accessory minerals.

See also: igneous rocks, list of rocks

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trachyte".