From words meaning "fire" & "broken", this type of flow of searing gas & rock swept down Mt. Pelee in 1902
Enormous volumes of volcanic ash and dust are expelled and 
swept down the... [DOC] [TLE] Chapter 9, Volcanoes and Other Igneous Activity - SpotiDoc [PAR] Nov 19, 2010 ... Intermediate rock typesandesite and dioritecontain about 60 percent silica.