Definition of feldspar Feldspar

/fɛˈldspɑˌɹ/ - [feldspar] - feld•spar

We found 6 definitions of feldspar from 6 different sources.

What does feldspar mean?

Noun Plural: feldspars
feldspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
		felspar
		spar making the motions of attack and defense with the fists and arms; a part of training for a boxer
		atomic number 14, silicon, si a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
		orthoclase a white or colored monoclinic feldspar
		oligoclase, plagioclase any of a series of triclinic feldspars that form rocks

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feldspar (Noun)
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.

feldspar
feld′spär, n. (min.) a general term for the most important rock-forming group of minerals—all anhydrous silicates of alumina—divided into those in which the minerals crystallise in monoclinic and in triclinic forms—also Fel′spar, Feld′spath.—adjs. Feldspath′ic, Feld′spathose. [Ger. feldspath—feld, a field, spath, spar.]

Feldspar is the name of a group of rock-forming minerals that make up as much as 60% of the Earth's crust.

Feldspar forms crystals from magma in both intrusive and extrusive rocks, and they can also happen as compact minerals, as veins, and are also present in many types of metamorphic rock. Rock formed entirely of plagioclase feldspar is known as anorthosite. Feldspar is also found in many types of sedimentary rock.

Feldspar is typically reddish or pale pink in color, and has a hardness of 6 on the Mohs scale.