Email this LII item:
Geodes: Small Treasure Vaults in Illinois
Illustrated fact sheet about these irregular, roughly spherical geological formations that are lined with mineral crystals. Describes the makeup of a geode and theories about geode formation. From the Illinois State Geological Survey.
http://www.isgs.uiuc.edu/maps-data-pub/publications/geobits/geobit3.shtml
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