Psilomelane mineral, manganese ore

Psilomelane mineral, manganese ore

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Psilomelane. Botryoidal form of the mineral psilomelane, an ore of manganese. Psilomelane composed mostly of the mineral romanechite, a barium manganese oxide mix. Here, botryoidal refers to the grape-like shapes, which formed due to underground hydrothermal (hot water) processes. Manganese is a valuable metal since it is an essential ingredient in steel and other alloys. The height of this sample is 11 centimetres.

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Keywords: barium, botryoidal, close-up, detail, earth science, geological, geology, manganese, manganese oxide, mineral, mineralogy, nature, ore, psilomelane, romanechite

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