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Geode
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==Further reading== *Pough, Fredrick H. ''Rocks and Minerals'', {{ISBN|0-395-91096-X}} *Middleton, Gerard V. (2003). ''Encyclopedia of Sediments and Sedimentary Rocks''. Springer, {{ISBN|978-1-4020-0872-6}}, p. 221 ({{Google books|r_2Ia8wOBlgC|restricted online copy|page=221}}) *Keller, Walter David (1961). ''The Common Rocks and Minerals of Missouri''. University of Missouri Press, {{ISBN|978-0-8262-0585-8}}, S. 67 ({{Google books|haCztne87E4C|restricted online copy|page=67}}) *Witzke, Brian J. [https://web.archive.org/web/20100202195106/http://www.igsb.uiowa.edu/browse/geodes/geodes.htm ''Geodes: A Look at Iowa's State Rock'']. Iowa Geological Survey *[https://www.uky.edu/KGS/rocksmineral/rm-rocks-geodes.php ''Geodes''] Kentucky Geological Survey (University of Kentucky)
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