PETER CHADWICK / SCIENCE PHOTO LIBRARY PETER CHADWICK / SCIENCE PHOTO LIBRARY
Manganese oxide. Dendritic form of manganese oxide (orange) in a sedimentary rock on a beach. These crystals, which are often mistaken for plant fossils, form when fissures in the rock are filled with manganese-rich water. Photographed at the De Hoop Nature Reserve, South Africa.
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