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feldspar

Pronunciation: /ˈfɛldspɑː/

(also felspar)

Definition of feldspar

noun

[mass noun]

an abundant rock-forming mineral typically occurring as colourless or pale-coloured crystals and consisting of aluminosilicates of potassium, sodium, and calcium.

Origin:

mid 18th century: alteration of German Feldspat, Feldspath, from Feld 'field' + Spat, Spath 'spar' (see spar³). The form felspar is by mistaken association with German Fels 'rock'