Geodes: Small Treasure Vaults in Illinois


Subject:
Geology , Minerals

Description:
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.

Publisher:
Illinois State Geological Survey

Language:
English

Source:
http://www.isgs.uiuc.edu/maps-data-pub/publications/geobits/geobit3.shtml


PID= res:lii-23749