a geode

Geology Science 2 of 2 appearances
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"a geode" appearances by year

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All Geology clues by year

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# Clue Answer As Given Value Round Category Air Date Show
Name of the type of formation seen here:[video clue - in Alex's hand] a geode DD $900 DJ GEOLOGY 1997-04-16 #2918
It's a spherical, hollow stone lined with crystals a geode $1,000 DJ ROCKS & MINERALS 1994-05-25 #2253
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