[mass noun]an abundant rock-forming mineral typically occurring as colourless or pale-coloured crystals and consisting of aluminosilicates of potassium, sodium, and calcium 长石
语源
mid 18th cent.: alteration of German Feldspat, Feldspath, from Feld 'field' + Spat, Spath 'spar' (see spar). The form felspar is by mistaken association with German Fels 'rock'