The Collaborative International Dictionary
Rhyolitic
Rhyolite \Rhy"o*lite\, n. [Gr. "rei^n to flow + -lite.] (Min.) A quartzose trachyte, an igneous rock often showing a fluidal structure. -- Rhy`o*lit"ic,, a.
Wiktionary
rhyolitic
a. Pertaining to, or composed of rhyolite