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bronzite

bronzite Min.
  (ˈbrɒnzaɪt)
  [f. as prec. + -ite.]
  A variety of diallage, having a bronze-like lustre.

1816 P. Cleaveland Min. 341 Bronzite. Its colors are brass or bronze yellow, or tombac brown. 1879 Rutley Stud. Rocks x. 121 Some bronzite is very feebly dichroic.

Oxford English Dictionary

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