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  1. A dark, earthy variety of the mineral siderite, occurring mixed with clay, sand, and considerable carbonaceous matter, and frequently associated with coal. Syn: blackband ore
  2. A thin layer (up to 10 cm in thickness) of blackband interbedded with clays or shales in blackband ironstone. AGI
  3. See: blackband ironstone

Source: Dictionary of Mining, Mineral, and Related Terms

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