Dictionary
feld•spar
Pronunciation: (feld'spär", fel'-), [key]—
n.
any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks.
Also,felspar.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.