Druzy Quartz (Blue), 248.9g, Brazil; Quartz Geode, 1737.9g, Bu Craa, Laayoune Province, Morocco; Septarian Geode with Iridescent Pyrite, 282.5g, Volga River, Ulyanocsk Oblast, Russia; Amethyst Geode, 656.0g, Brazil. Includes book, The Encyclopedia of Gemstones and Minerals by Martin Holden, featuring photographs from the British Museum of Natural History, 1999.
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