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Dufrenite

Source : Webster's Revised Unabridged Dictionary (1913)

Dufrenite \Du*fren"ite\, n. [From ??ierre Armand Dufr['e]noy, a
   French geologist.] (Min.)
   A mineral of a blackish green color, commonly massive or in
   nodules. It is a hydrous phosphate of iron.
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