Rhyolite
Photoswellerr@cochise.edu copyright 2007
rhyolite, tan
Rhyolite is usually a pastel color: off white, gray,
tan, pink, etc.
This close up view of a broken surface of rhyolite shows some
small
lithic fragments
along with tiny biotite phenocrysts.

Photo is copyright free for
non-commercial educational uses.
Just credit photo to R.Weller/Cochise
College.