Rhyolite

Type	Igneous Rock
Texture	Aphanitic (Fine-grained)
Origin	Extrusive/Volcanic
Chemical Composition	Felsic
Color	Light Gray
Mineral Composition	Potassium Feldspar, Quartz, Sodium Plagioclase, Biotite, Hornblende
Miscellaneous	Flow banding
Tectonic Environment	Convergent Boundary – Andean-type subduction zones, intracontinental hot spots and rifts