How Are Geodes Formed?

Answer

Geodes are formed when layers of rock have empty cavities. Fluids that can contain a variety of dissolved minerals eventually make their way into the cavities, and the crystals of the geodes grow within that confined space. You can find more information here: http://www.rocksforkids.com/R&M/geodes.html
Q&A Related to "How Are Geodes Formed"
A geode is a rock with crystal inside and a lumpy exterior. Exactly how they were formed is not really known. Many believe that they were formed by bubbles from rocks in a volcano
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Cavity Geodes, which take thousands of years to form, begin with the formation of a cavity. This cavity can be the inside of a shell that is stuck in sediment. The shell will fill
http://www.ehow.com/how_5004589_how-geodes-formed....
We don't know but we have a theory for two types. Partly hollow balls filled mostly with
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Unknown, but one theory is appx 240m years. There is much that is still not understood about the mysterious geode.
http://wiki.answers.com/Q/How_long_does_it_take_fo...
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Ask.com Answer for: how are geodes formed
How Are Geodes Formed?
Geodes, which take thousands of years to form, begin with the formation of a cavity. This cavity can be the inside of a shell that is stuck in sediment. The shell will fill with a concentration of salt. The shell can either turn into a fossil or be... More »
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Source: www.ehow.com
Different types of geodes are formed in different ways. For instance, a volcanic geode is formed by cooling lava while a sedimentary geode is formed in an underwater process where sediments attach themselves to tiny animals. You can find more information here: http://earthsky.org/earth/how-are-geodes-formed
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Geodes can form in gas bubbles in igneous rocks, or in rounded cavities formed in sedimentary rock formations. After the surrounding rock hardens, silicates or ...
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