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Encyclopedia Britannica - Main :: VIR-WAT |
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WAD , a black
mineral
manganese dioxide; of importance as an ore. Being an amorphous substance, it varies considerably in chemical composition , and contains different impurities often in large amount. A variety containing much cobalt oxide
psilomelane
manganese minerals, and is often deposited in marshes (" bog manganese ") or by springs. The name wad is of uncertain origin, and has been applied also to graphite
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