Phyric Dacite

Some articles on phyric dacite, dacite:

Mount Cayley - Geology - Eruptive History
... eruption of lava and ash, such as plagioclase-hypersthene-hornblende-phyric dacite flows, tephra, and pyroclastic breccia, and concluded with the formation of a central lava dome which develop the ... breccia with plagioclase-hypersthene-hornblende-biotite-phyric dacite erupted throughout Cayley's second phase of activity, forming the largest of a number of small ... activity began about 300,000 years ago with the eruption of a dacite lava flow into the extant valley of Shovelnose Creek and concluded with the construction of two ...