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A hexagonal mineral, (Co,Ni)1-y (MnO2 )2-x (OH)2-2y+2x .nH2 O ; a soft, black, earthy aggregate commonly classed as a variety of "wad," the cobalt content reaching as high as 32% (40% cobalt oxide). Syn: asbolane; asbolite; black cobalt; cobalt ocher; wad.
Source: Dictionary of Mining, Mineral, and Related Terms

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