Feldspar meaning

fĕl-
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.
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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.
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Any of a group of abundant monoclinic or triclinic minerals having the general formula MAl(Al,Si)3 O8 , where M is either potassium (K), sodium (Na), or calcium (Ca) or less commonly barium (Ba), rubidium (Rb), strontium (Sr), or iron (Fe). Feldspars range from white, pink, or brown to grayish blue in color. They occur in igneous, sedimentary, and metamorphic rocks and make up more than 60 percent of the Earth's crust. When they decompose, feldspars form clay or the mineral kaolinite.
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(mineralogy) Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.
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Origin of feldspar

  • Partial translation of obsolete German Feldspath Feld field (from Middle High German veld) (from Old High German feld pelə-2 in Indo-European roots) Spath spar

    From American Heritage Dictionary of the English Language, 5th Edition

  • Feld, field (from Middle High German veld, from Old High German feld) + Spath, spar

    From Wiktionary