Colored sandstone in Petra, Jordan
Colored sandstone in Petra, Jordan. The natural patterns were formed by redox reactions, happening over a long time interval within an aquifer. Different colored zones contain different metal oxides. Sometimes these patterns are called "Liesegang rings", although the formation is different.
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Photo credit: © Florian Neukirchen / Alamy / Afripics
License: Licensed
Model Released: No
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