Template:Unreferenced stub - ryodacit.jpg

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.

Template:Commons categoryTemplate:Volcanology-stub

Community content is available under CC-BY-SA unless otherwise noted.