Trachyte Guide, Meaning , Facts, Information and Description
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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