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Geodes and Crystals: Identification, Types and Value

A geode is a rounded rock with a cavity whose walls are lined with crystals growing inward, and nearly all of the questions people ask about them come down to four things: is it really a geode, is it hollow, what grew inside, and what is it worth. These pages answer those from geological surveys, museum and auction records rather than folklore. Every hardness value, locality, measurement and price here comes from a named source with a date, and where the evidence is thin the pages say so.