Definition of feldspar in English:

feldspar

Syllabification: feld·spar
Pronunciation: /ˈfel(d)ˌspär
 
/

noun

  • An abundant rock-forming mineral typically occurring as colorless or pale-colored crystals and consisting of aluminosilicates of potassium, sodium, and calcium.
    More example sentences
    • Quartz is associated most commonly with aegirine and potassium feldspar as well as zircon.
    • Larger crystals of feldspar and quartz dominate the host rock.
    • These granite dikes are composed almost totally of potassium feldspar and quartz.

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'.

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