In gem and lapidary circles, “Wagyl stone” is sometimes used to refer to a variety of jasper with characteristic color patterns found in south western Austrailia.
A type of rhyolite found throughout Utah and a few other states. Utah Wonderstone has been collected for decades by rockhounds traveling U.S. Highway 36 near Vernon. Roadside shops often sold it as a “souvenir stone of Utah.”
Yellowcat Jasper slab collected in Yellowcat Utah. Many of the agate and jasper stones from the area appear as boring black rock due to their coating of manganese oxide. Like other jaspers, it is primarliy made of silicon dioxide, with impurities to provide patterns and color.