geode

     

Geoes (Greek geoides, "earthlike") are geological rock formations which occur in sedimentary and certain volcanic rocks. Geodes are essentially rock cavities or vugs with internal crystal formations or concentric banding. The exterior of the most common geodes is generally limestone or a related rock, while the interior contains quartz crystals and/or chalcedony deposits. Other geodes are completely filled with crystal, being solid all the way through. These types of geodes are called nodules.

Trivia about geode

  • It's the earthy term for crystal lime nodules like the one seen here
  • Name of the type of formation seen here:[video clue - in Alex's hand]
  • Blythe, California has an area for collecting these spherical crystal-filled rocks
  • (Sarah of the Clue Crew delivers the clue from the Harvard Museum of Natural History in Cambridge, MA.) Weighing in at more than 1,600 pounds, the giant chunk of amethyst here is one of these stones that form under pressure inside cavities, from the Latin for "earth"

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