Source : Webster's Revised Unabridged Dictionary (1913)

Felspar \Fel"spar`\, Felspath \Fel"spath`\, n. (Min.)
   See {Feldspar}.

Source : WordNet®

felspar
     n : any of a group of hard crystalline minerals that consist of
         aluminum silicates of potassium or sodium or calcium or
         barium [syn: {feldspar}]