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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A blackish-green mineral that is a hydrous phosphate of iron.

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron.

from The Century Dictionary and Cyclopedia

  • n. A native hydrous iron phosphate, generally massive with radiated fibrous structure. It has a dark-green color, but changes on exposure to yellow or brown.


Dufrénoy +‎ -ite, after French geologist Pierre Armand Dufrénoy. (Wiktionary)


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