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 ?
La+ tend to be concentrated in fine grained sediments, being diluted by quartz in coarser material (Culler et al., 1979), and commonly resides in feldspars and accessory minerals.
Feldspars and carbonates are ubiquitous minerals that are known to luminesce under electron bombardment.
Exotic gems; v.1: How to identify and buy tanzanite, ammolite, rhodochrosite, zultanite, sunstone, moonstone, & other feldspars.
In the present study the classification proposed by Pettiijohn et al (1973) and Pettijhon (1975) been adopted where Q-pole represents quartz, F-pole represents feldspars and R-pole represents rock fragments (Table -5).
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.
(1974), anorthite-poor melts in the water-saturated NaAl[Si.sub.3][O.sub.8] - KAl[Si.sub.3][O.sub.8] -Si[O.sub.2] subsystem, can crystallize progressively more sodic feldspars that, later, become more potassic.
Except for rose to red-brown colour of feldspars and higher porosity, the macroscopic features of episyenite are similar to those of the original unaltered granite.
Plagioclase dramatically removes Sr at intermediate stages and alkali feldspars sequester Ba and Rb as late-stage trachytes and phonolites form in alkaline magmas.
The moist, warm climate of this region leads to rapid weathering of feldspars, so that the soil in the upper parts of the valleys is a sort of humus enriched with granite sand.
X-ray and optical investigation of feldspars from Estonian early platform potassium granites.
and Parsons, I., 1989, Alkali feldspars: ordering rates, phase transformations and behavior diagrams for igneous rocks, Mineralogical Magazine, v.