Definition of geode in English:

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Pronunciation: /ˈjēōd/


1A small cavity in rock lined with crystals or other mineral matter.
Example sentences
  • Colorless quartz crystals lining geodes have also been found at approximately 300 feet below the trail at the South Overlook locality.
  • Mordenite lines most of the geodes as the typical fine hairlike crystals of the species.
  • One case has a selection of crystal-lined geodes, several filled with amethyst, from the Josini area of northern KwazuluNatal in South Africa.
1.1A rock containing a cavity lined with crystals or other mineral matter.
Example sentences
  • ‘This is a once-in-a-lifetime opportunity,’ exclaimed a collector from the Keokuk area who was working beside me splitting geodes out of shale.
  • Two adjacent geodes from the same piece of shale could be cracked open, and one would be lined with brown calcite, the other with quartz.
  • It's centered around this hill with all these geodes, and a stone archway at the top.



Pronunciation: /jēˈädik/
Example sentences
  • Open conduits and caverns, geodic sparite cement and other exotic minerals characterize this phase.
  • Some preserve textures reminiscent of the drusy lining of geodic quartz and these textures are thought to be primary and contemporaneous with the hydrothermal alteration.


Late 17th century: via Latin from Greek geōdēs 'earthy', from 'earth'.

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