Wad is an oldmining term for any blackmanganeseoxide orhydroxide mineral-rich rock in the oxidized zone of variousore deposits. Typically closely associated with variousiron oxides. Specific mineral varieties includepyrolusite,lithiophorite,nsutite,takanelite andvernadite.^[1] Wad can be considered to be the manganese equivalent to the ironmineraloidlimonite.

• Palache, Charles; Berman, Harry; Frondel, Clifford (1944),The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides (7th, revised and enlarged ed.), New York: John Wiley and Sons, Inc., pp. 566–567

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• Manganese minerals
• Oxide minerals
• Hydroxide minerals
• Hydrates

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