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kidney ore

noun

  1. geology a form of hematite that occurs in kidney-shaped masses
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Example Sentences

It is the kidney ore of Cumberland, which is smelted at Ulverstone with charcoal, into excellent steel iron.

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