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- Dacite
Volcanic igneous rock made of quartz and plagioclase phenocrysts and the ground mass of glass and microlites of the same ingredients; deep equivalent: granodiorite and kvarcdiorit
Dacite is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. It is composed predominantly of plagioclase feldspar and quartz. Dacite is relatively common, occurring in many tectonic settings. It is associated with ande... Wikipedia
