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Jarosite is a basic hydrous sulfate of potassium and iron. This sulfate mineral is formed in ore deposits by the oxidation of iron sulfides. Jarosite is often produced as a byproduct during the purification and refining of zinc and is also commonly associated with acid mine drainage environments. The sample shon in the first three photos below have reddish-brown jarosite crystals on a matrix rock mined at Warm Springs Mine, Lander County, Nevada. the next two samples from Idaho show different-colored jarosite crystals. (source: Wikipedia) Photos by Kelly's Rocks (www.kellysrocks.com - from whom I bought the Nevada sample) above photo by Rob Lavinsky of a sample from Chihuahua, Mexico, photo used with permission Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage