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Wad (mineral)

Porous secondary manganese oxyhydroxide From Wikipedia, the free encyclopedia

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Wad is an old mining term for any black manganese oxide or hydroxide mineral-rich rock in the oxidized zone of various ore deposits. Typically closely associated with various iron oxides. Specific mineral varieties include pyrolusite, lithiophorite, nsutite, takanelite and vernadite.[1] Wad can be considered to be the manganese equivalent to the iron mineraloid limonite.

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