These geodes were found in Utah and halved to reveal the crystalline structure within. Approximately 6 to 8 million years ago (Miocene epoch), volcanic activity occurred in western Utah and deposited an extrusive igneous rock called rhyolite. Trapped gasses formed cavities within the rhyolite, and millions of years of ground-water circulation allowed minerals to precipitate into the cavities. The result is geodes with spherical shapes and crystal-lined cavities. Material: Rhyolite, with quartz and agateLocation: UtahWeight: Approximately 0.7 lbsDimensions: Approximately 4 x 3.25 x 1.5" This product is formed naturally and each stone may vary in size, shape, and color. The specimen you receive may not be exactly as pictured, but we take great care in selecting specimens that have similar appearances.
