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beudantite

beudantite Min.
  (ˈbjuːdəntaɪt)
  [f. Beudant, name of a French mineralogist, + -ite.]
  A mineral occurring in modified acute rhombohedrons, containing sesquioxide of iron and oxide of lead, with phosphoric or arsenic acid, or both. (Dana.)

1826 A. Levy in Ann. Philos. II. 194 The two [specimens]..belong, I believe, to two new species. For one of them I propose the name of Beudantite, in honour of Mr. Beudant. 1850 Phil. Mag. XXXVII. 167 Beudantite is chiefly composed of sesquioxide of iron and oxide of lead. 1960 Mineral. Mag. June 423 Carminite and beudantite are both rare minerals for which very few localities have hitherto been recorded.

Oxford English Dictionary

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