an abundant rock-forming aluminosilicate mineral, typically colourless or pale-coloured.
Derivative
feldspathicadj.
Etymology
C18: alt. of Ger. Feldspat, Feldspath, from Feld ‘field’ + Spat, Spath ‘spar’ (see spar3); the form felspar is by mistaken assoc. with Ger. Fels ‘rock’.