rhyolite

/ˈɹaɪ.əˌlaɪt/

ɹAꞮ · əlaɪt (2 syllables)

English Noun

Definition

An igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture.

Etymology

Coined by Ferdinand von Richthofen as German Rhyolith, from Ancient Greek ῥέω (rhéō, “flow”) + λίθος (líthos, “stone”) (modified to + -lite).