feldspar

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feld·spar

 (fĕld′spär′, fĕl′-) also fel·spar (fĕl′-)
n.
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.

[Partial translation of obsolete German Feldspath : Feld, field (from Middle High German veld, from Old High German feld; see pelə- in Indo-European roots) + Spath, spar.]

feldspar

(ˈfɛldˌspɑː; ˈfɛlˌspɑː) or

felspar

n
(Minerals) any of a group of hard rock-forming minerals consisting of aluminium silicates of potassium, sodium, calcium, or barium: the principal constituents of igneous rocks. The group includes orthoclase, microcline, and the plagioclase minerals
[C18: from German feldspat(h), from feld field + spat(h) spar3]
feldspathic, felˈspathic, ˈfeldspathˌose, ˈfelspathˌose adj

feld•spar

(ˈfɛldˌspɑr, ˈfɛl-)

also felspar



n.
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 constituents of igneous rocks.
[1765–75; alter. of feldspath < German (Feld field + Spat(h) spar)]

feld·spar

(fĕld′spär′, fĕl′spär′)
Any of a group of abundant minerals consisting of silicates of aluminum with potassium, sodium, and calcium. 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.

feldspar

Any of a group of minerals comprising aluminum silicates and a metal (calcium, potassium, or sodium).
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.feldspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
atomic number 14, Si, silicon - 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
moonstone - a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar
spar - any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable
Translations
maasälpä

feldspar

[ˈfeldspɑːʳ] Nfeldespato m
References in periodicals archive ?
Potassium based feldspars are used in art ware, pottery, high tension electrical insulators and hotel china.
Feldspars and carbonates are ubiquitous minerals that are known to luminesce under electron bombardment.
1: How to identify and buy tanzanite, ammolite, rhodochrosite, zultanite, sunstone, moonstone, & other feldspars.
Minspar #3, #4, #7 and #10 feldspars used in translucent or clear plastics because of its low-tint strength, stain resistance, high loading, and reportedly excellent abrasion resistance.
1987, Determining (Al,Si) distribution and strain in alkali feldspars using lattice parameters and diffraction-peak positions: A review, American Mineralogist, v.
This section contained the largest concentration and variety of identifiable mineral grains; these included quartz, microcline and plagioclase feldspars, muscovite, and a large amount of kyanite (Fig.
In this connection minerals with good dosimetrical properties, like quartz and feldspars extracted from sediments and ancient ceramic, are widely used as palaeodosimeters in luminescence dating.
It is, however, more refractory and goes into a melt at a higher temperature than either sodium or potassium feldspars due to its higher silica content.
The MWG contains feldspars of various textures and composition, including abundant plagioclase-mantled K-feldspar (rapakivi texture), boxy and spongy cellular plagioclase, and plagioclase that show An spikes and/or central cures of higher Ca content.
Petrographic observation of the samples analyzed in the present study, as well as the samples studied by Plymate and others (1992) and Plymate and others (2001), reveals that the feldspars are significantly clouded by alteration to cryptocrystalline clays, mica, and/or hematite.
Product Overview II-3 Feldspar: A Common Silicate II-3 General Chemical Formula II-3 Na-Feldspars are Widely Used II-3 Physical Properties II-4 Grades II-4 Glass Grade II-4 Ceramic Body Grade II-4 Glaze Grade II-4 Types II-5 Potassium Feldspar Group II-5 Plagioclase Feldspar Group II-5 Other Feldspars II-5 Rare Feldspars II-5 Characteristics of Major Feldspar Minerals II-6 Albite (moonstone) II-6 Oligoclase Feldspar II-6 Anorthite II-7 Microcline II-7 Orthoclase II-8 History II-8 Feldspars as Gemstones II-8 Principal Stones in Feldspar Group II-9 Labradorite II-9 Moonstone II-9 Sunstone II-9 Amazonite II-9 Orthoclase II-10 Occurrence II-10 Ores and Production Process II-10 Places of Origin II-10 Production II-11