Wad
From Infogalactic: the planetary knowledge core
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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.
Notes
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External links
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Look up wad or WAD in Wiktionary, the free dictionary. |
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Wikisource has the text of the 1911 Encyclopædia Britannica article Wad. |
