Black ore

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  1. Eng. Partly decomposed pyrite containing copper. Fay
  2. In uranium mining, the term may mean ore containing a high proportion of pitchblende, uraninite, coffinite, or vanoxite.
  3. Cumb. A variety of hematite in hard pieces, some kidney shaped, reaching the size of one's hand, in a moderately soft, dark-red, brown, or nearly black mass of smit clay and manganese oxide, the whole having a most confused appearance.

Source: Dictionary of Mining, Mineral, and Related Terms

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