157 results for rhyolite

Rhyolite is an extrusive igneous rock formed as a deposit of volcanic ash. The ash becomes rock after being exposed to extreme heat and pressure. Iron oxide stains create the beautiful patterns...

Leopard Skin Jasper is named for its lovely and colorful pattern. It is an orbicular jasper with mottled reds, pinks, yellows, and browns and resembles the fur of a leopard. Though called a jasper...

The best picture jaspers in the world come from the Oregon-Idaho border. Jasper is a member of the chalcedony family.Chalcedony, pronounced kal sid nee, is any form of microcrystalline quartz. “ Jaspe

Kabamba Jasper is a lovely green orbicular jasper from Madagascar.  Kabamba Jasper is green orbicular rock from the South Africa Rift on the west side of the island of Madagascar. This...

Ocean Jasper is from a silicified rhyolite ash flow off the northwest coast of Madagascar. The area is near the village of Marovato.  It was discovered around 2000 and was vary plentiful at...

Snowflake Obsidian is a black obsidian with whitish-gray spots of radiating needle-shaped cristobalite crystals. A lot of Snowflake Obsidian is from Millard County, Utah. Approximately 2.5...

Bruneau Jasper is a beautiful semiprecious stone that comes from the remote canyon near the Bruneau River in western Idaho. The area is about 30 miles south of the tiny town of Bruneau. It is...

Willow Creek Jasper is a well known semiprecious gemstone material that comes from Idaho. It is found about 15 miles north of Eagle, Idaho, which is northeast of Boise. The mine has been producing...

Wisconsin is one of the best states in the U.S. for finding a rocks, crystals and minerals. Wisconsin is a rolling plain laid down on sedimentary rocks and broken in places by uplifted igneous and...

  Missouri's major mineral resources include lead ore, iron ore, zinc, barite, and limestone. Galena was named the official state mineral of Missouri in 1967. Galena is a major source of lead...