Cathedral Geode

Cathedral geodes are a fascinating member of the quartz crystal family. Most excellent Amethyst geodes come from a region along the Brazil-Uruguay border. The geodes are mined from several lava flows belonging to the Parana Continental Flood Basalt Province. This was one of the largest outpourings of basalt lava known. An estimated 800,000 cubic kilometers of lava extruded over an 11-million-year time span. Base is 7 1/2 W top W is 3 2/3 . Length is 9 1/2 in. Thus is quite heavy.

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