feldspar

feld·spar

noun \ˈfel(d)-ˌspär\

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

Rhymes with FELDSPAR

Adar, Adzhar, afar, ajar, all-star, armoire, attar, bar car, bazaar, beaux arts, bête noire, beurre noir, Bihar, bizarre, boudoir, boxcar, boyar, Bronze Star, bulbar, Bulgar, bursar, bus bar, canard, cash bar, catarrh, Cathar, chair car, chukar, cigar, clochard, club car, coal tar, cougar, couloir, crossbar, crowbar, Dakar, daystar, debar, decare, devoir, dinar, disbar, Dog Star, drawbar, durbar, earthstar, Elgar, eschar, eyebar, fern bar, film noir, five-star, fixed star, flatcar, fluorspar, four-star, fulmar, gaydar, gazar, guitar, Gunnar, Hagar, handcar, horsecar, hussar, Invar, Iyar, jaguar, Kádár, leaf scar, Lehár, lidar, Lifar, Loire, lounge car, lumbar, jack-tar, jowar, Khowar, lahar, lekvar, lodestar, Magyar, malar, memoir, Mylar, NASCAR, Navarre, nightjar, North Star, pace car, paillard, peignoir, pinch bar, Pindar, pine tar, pissoir, planar, plantar, polestar, pourboire, prowl car, pulsar, Qatar, qintar, quasar, radar, railcar, raw bar, rebar, red star, roll bar, Safar, Samar, sandbar, scalar, scout car, Sennar, shofar, sidebar, sidecar, sirdar, sitar, slop jar, slot car, snack bar, sofar, solar, sonar, sports bar, sports car, stock car, streetcar, Svalbard, sway bar, tank car, T-bar, toolbar, town car, tramcar, trocar, unbar, volar, voussoir, Weimar

feldspar

noun    (Concise Encyclopedia)

Any of a group of aluminosilicate (containing aluminum and silicon) minerals that also contains calcium, sodium, or potassium. Feldspars are the most common minerals in the Earth's crust and are the major component in nearly all igneous rocks found on the Earth, on the Moon, and in some meteorites. They also are common in metamorphic and some sedimentary rocks. Their complex chemical and structural properties make them useful for interpreting the origins of rocks. Natural feldspars can be divided into alkali and plagioclase feldspars.