JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Pyrolusite mineral, dendritic form. Pyrolusite is a mineral form of manganese dioxide. Here, it is in dendritic form, where tree-like dendrites of black manganese dioxide are seen branching through a cut and polished slice of the mineral.
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