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WAD

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Originally appearing in Volume V28, Page 225 of the 1911 Encyclopedia Britannica.
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WAD , a See also:

black, earthy See also:mineral consisting mainly of hydrated See also:manganese dioxide; of importance as an ore. Being an amorphous substance, it varies considerably in chemical See also:composition, and contains different impurities often in large amount. A variety containing much See also:cobalt See also:oxide is called " asbolite," while " lampadite " is a cupriferous variety. It is very soft, readily soiling the fingers, and may be considered as an earthy See also:form of See also:psilomelane (q.v.). It results from the decomposition of other manganese minerals, and is often deposited in marshes (" See also:bog manganese ") or by springs. The name wad is of uncertain origin, and has been applied also to See also:graphite. (L. J.

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