any of several light-colored, hard, glassy, monoclinic or triclinic minerals made up of aluminum silicates with sodium, potassium, or calcium, found in all types of rock
Origin of feldsparaltered ; from German feldspath (now feldspat) ; from feld, field + spath, spar ; from Indo-European base an unverified form spe-, long, flat board from source spoon, spade
Any of a group of abundant rock-forming minerals occurring in igneous, metamorphic, and sedimentary rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely barium. About 60 percent of the earth's outer crust is composed of feldspar.
Origin of feldsparPartial translation of obsolete German Feldspath : Feld, field (from Middle High German veld, from Old High German feld; see pel&schwa;-2 in Indo-European roots) + Spath, spar.
Feld, field (from Middle High German veld, from Old High German feld) + Spath, spar