Rock Talk Library

Read about iridescent Fire Agates, Dinosaurs, the Dugway Geode Beds, Petrified Wood, Devil's Slide and much more! You may want to bookmark the Rock Talk Library to come back again and again!

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Investigate Your World

Ready to take your own journey into the Utah outback? Join our rock-hounders to explore and hunt for stones, agates, fossils and more! Find out more about these remarkable guided adventures!

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Visitors Are Welcome

Intrigued by rocks and agates? Fascinated by fossils? Do crystals and geodes stop you in your tracks? Join us to learn about earth sciences like geology, mineralogy and paleontology!

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Rules and Regulations Regarding Rock, Mineral, & Fossil Collecting in Utah

by Geologic Information and Outreach Staff Utah Geological Survey Utah’s rock, mineral, and fossil collectors must adhere to rules and regulations established by owners or managing agencies of the lands on which they wish to collect. Prior to collecting, rockhounds should determine ownership of the lands they intend to visit and familiarize themselves with the

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Sunstones

at Sunstone Knoll, Millard County Geologic information: Sunstone Knoll is formed of volcanic vents that erupted during the early Pleistocene (1.6 million years to about 750,000 years ago). These eruptions left deposits of basaltic lava and volcanic breccia (angular, broken rock fragments held together in a matrix of finer grained material). Sunstone is a transparent, yellowish

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Topaz & Other Minerals

Found at Topaz Mountain, Juab County Geologic Information: Topaz, Utah’s state gem, is a semiprecious gemstone that occurs as very hard, transparent crystals in a variety of colors. The topaz crystals at Topaz Mountain are naturally amber colored, but become colorless after exposure to sunlight. The crystals formed within cavities of the Topaz Mountain Rhyolite, a

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