noun feld·spar \ˈfel(d)-ˌspär\

: a very common type of mineral

Full Definition of FELDSPAR

:  any of a group of crystalline minerals that consist of aluminum silicates with either potassium, sodium, calcium, or barium and that are an essential constituent of nearly all crystalline rocks

Origin of FELDSPAR

modification of obsolete German Feldspath (now Feldspat), from German Feld field + obsolete German Spath (now Spat) spar
First Known Use: 1772

Other Mineralogy Terms

agate, host, inclusion, matrix, streak


Next Word in the Dictionary: feldspathicPrevious Word in the Dictionary: feldsherAll Words Near: feldspar
July 06, 2015
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