Geodes

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General information on geodes

A Geode is simply a rock with a cavity lined with minerals. The most common types of minerals found in Geodes are quartz and calcite but other mineral species can be found; such as celestite, chalcedony,pyrite, gypsum barite,hematite and many others. Geodes are formed in both sedimentary and igneous rocks, Cavities in the host rock are slowly lined with minerals that seep into the cavity dissolved in rain water. Typically the source of silica for the quartz crystal lining is volcanic ash fall. If the cavity is completely filled with minerals it is no longer a Geode but a Nodule. Geodes can be found in many locations throughout the country wherever limestone rock or rocks of volcanic origen are found.

Where to find it:

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GPS Coordinates, if known: Town/region: Hancock County State, country: IL Tips for finding it:	GPS Coordinates, if known: Town/region: State, country: Tips for finding it:
GPS Coordinates, if known: Town/region: Keokuk State, country: Iowa Tips for finding it: Within a 35 mile radius of Keokuk is one of the nation's hottest spots for collecting Geodes. Search the streams, fields, and road cuts in the area. You will find Geodes. Over 30 minerals can be found in the centers, although most of the centers are quartz and calcite.	GPS Coordinates, if known: Town/region: State, country: Tips for finding it:

Tools needed: Shovel, bucket, hand pick, gloves, hat





Special skills needed: Do not break the geodes with a hammer, they can be easily rendered valueless.
Check the weight of a geodes against each other. The lighter geodes are more than likely hollow.


Identification tips: The Keokuk Geodes have a cauliflower appearance to them. This is true with many sedimentary Geodes. Igneous geodes are generally rounder in appearance.




Additional helpful resources:
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Please check out the Iowa National Directory for more information. Also visit the Oregon National Directory for Geodes, (Thunder Eggs)



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