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  Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite. It is the extrusive equivalent of granodiorite. Phenocrysts of sodium rich plagioclase, sanidine, quartz, and biotite or hornblende are typically set in an aphanitic to glassy light to intermediate colored matrix. Rhyodacite is a high silica rock and often exists as explosive pyroclastic volcanic deposits.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rhyodacite". A list of authors is available in Wikipedia.
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