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cronstedtite

cronstedtite Min.
  (ˈkrɒnstɪtaɪt)
  [Named after Cronstedt, a Swedish mineralogist: see -ite.]
  A hydrous silicate of iron and manganese.

1823 W. Phillips Min. 227 Cronstedite..is described..as occurring both massive and crystallized.

Oxford English Dictionary

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