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)