![21.4 Lapilli tuff rhyolite. Poorly lithified. Annadel State Park, California. Gray matrix of aphanitic to very fine-grained volcanic ash encloses lapilli of various volcanic rock types and quartz. [Sharpened end of pencil approximately 1.5 cm for scale.]](../21.4.JPG)
21.4 Lapilli tuff rhyolite. Poorly lithified. Annadel State Park, California. Gray matrix of aphanitic to very fine-grained volcanic ash encloses lapilli of various volcanic rock types and quartz. [Sharpened end of pencil approximately 1.5 cm for scale.]