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cordierite

cordierite Min.
  (ˈkɔːdɪəraɪt)
  [Named (in 1813) after Cordier a French geologist. See -ite.]
  A synonym of iolite.

1814 T. Allan Min. Nomen., Cordierite. 1879 Rutley Study Rocks xii. 210 Cordierite-granite is a variety..containing cordierite or iolite.

Oxford English Dictionary

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