dufoil (dufoil)

and a. [L. duo (= E. two ) + E. foill, II. a. In her., having only two leaves. dufrenite (dū-fren'it), n. [From the French mineralogist P. A. Dufrénoy (1792-1857).] A native hydrous iron phosphate, generally ma ive with radiated fibrous structure. It has dark-green color, but changes on exposure to yellow or brown.