Rhyodacite

Rhyodacite

La rhyodacite est une roche volcanique extrusive de roche dont la composition constitue un intermédiaire entre la dacite et la rhyolite. C'est l'équivalent extrusif de la granodiorite. Des phénocrystes de sodium, riches en plagioclase, sanidine, quartz, et biotite ou hornblende sont typiquement placés dans un aphanitic à la lumière vitreuse à la matrice colorée intermédiaire. La rhyodacite est une roche à haute teneur en silice et se trouve souvent sous forme de dépôts volcaniques pyroclastiques explosifs.

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  • rhyodacite — rhyo·dacite …   English syllables

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