Rhyolite is an extrusive igneous rock that is usually light in color, often exhibiting, white, gray, brownish, magenta, or reddish hues. Samples may also be multicolored or exhibit distinct banding. Certain varieties of rhyolite are utilized as gemrocks or for ornamental purposes. A thinly banded type is commonly known as wonderstone, although the same name is sometimes applied to a similar looking variety of banded sandstone. Some spherulitic rhyolites are known commercially as birdseye, and other ornamental types of rhyolite have been known by the names elixerite, hickoryite, and liparite.