potassium feldspar
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Feldspar — is the name of a group of rock forming minerals which make up as much as 60% of the Earth s crust.Feldspar. [http://www.ima na.org/about industrial minerals/feldspar.asp What is Feldspar?] Industrial Minerals Association. Retrieved on July 18… … Wikipedia
feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… … Universalium
Potassium — (pronEng|pəˈtæsiəm) is a chemical element. It has the symbol K ( la. kalium, from ar. qalīy), atomic number 19, and atomic mass 39.0983. The name potassium comes from the word potash , as potassium was first isolated from potash. Potassium is a… … Wikipedia
feldspar — [feld′spär΄] n. [altered < Ger feldspath (now feldspat) < feld, FIELD + spath, spar < IE base * spe , long, flat board > SPOON, SPADE1] any of several light colored, hard, glassy, monoclinic or triclinic minerals made up of aluminum… … English World dictionary
potassium — /peuh tas ee euhm/, n. Chem. a silvery white metallic element that oxidizes rapidly in the air and whose compounds are used as fertilizer and in special hard glasses. Symbol: K; at. wt.: 39.102; at. no.: 19; sp. gr.: 0.86 at 20°C. [1800 10; < NL; … Universalium
feldspar — noun Etymology: modification of obsolete German Feldspath (now Feldspat), from German Feld field + obsolete German Spath (now Spat) spar Date: 1772 any of a group of crystalline minerals that consist of aluminum silicates with either potassium,… … New Collegiate Dictionary
feldspar — noun Any of a large group of rock forming minerals that, together, make up about 60% of the earths outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal… … Wiktionary
feldspar — the generic name for a group of minerals made up of aluminium silicate along with calcium, potassium or sodium. A component of granite … Geography glossary
feldspar — feld•spar [[t]ˈfɛldˌspɑr, ˈfɛl [/t]] also felspar n. mir any of a group of crystalline minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important… … From formal English to slang
feldspar — n. (also felspar) Mineral. any of a group of aluminium silicates of potassium, sodium, or calcium, which are the most abundant minerals in the earth s crust. Derivatives: feldspathic adj. feldspathoid n. Etymology: G Feldspat, spath f. Feld FIELD … Useful english dictionary
