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feldspar
feldspars
feldspars The most important group of rock-forming
silicate minerals, including the
alkali feldspars KAlSi
3O
8 to NaAlSi
3O
8 (K-feldspar to
albite) and the
plagioclase feldspars NaAlSi
3O
8 to CaAl
2Si
2O
8 (
albite to
anorthite). The potassium, sodium, and calcium
end-members can be taken to represent the three apices of an equilateral triangle into which all the alkali feldspars and the plagioclase feldspars can be plotted (usually with the plagioclase feldspars along the base of the triangle and the alkali feldspars along the left-hand side).
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Feldspar and nepheline syenite: fillers with a purpose.
Magazine article from: Paint & Coatings Industry; 10/1/2003; ; 700+ words
; ...is a calcium feldspar. Most commercial feldspars are produced...balance of the feldspar and nepheline...2) Milled feldspars and nepheline...coatings-grade feldspars and nepheline...in Table 2. Feldspar and nepheline...
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Quartz-feldspar separation for the glass and ceramics industries
Magazine article from: Minerals & Metallurgical Processing; 5/1/2007; ; 700+ words
; ...obtained Keywords: Feldspar, Magnetic separation...Introduction All feldspars contain silicon...after clay. Feldspar does not have...temperatures. Feldspars are used as fluxing...flotation of feldspars differently. Feldspar recovery was...
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Feldspar Market Review.
M2 Presswire; 1/6/2009; 572 words
; ...January 2009-Research and Markets: Feldspar Market Review(C)1994-2009 M2 COMMUNICATIONS...researchandmarkets.com/research/092ca9/feldspar_market_re) has announced the addition of the "Feldspar Market Review" report to their offering...
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Feldspar and nepheline syenite
Magazine article from: Mining Engineering; 6/1/2000; ; 700+ words
; US feldspar output sold or used in 1999 was an estimated 900 kt (990,000...990,000-st) level. Output included flotation concentrates, feldspar content in feldspar-silica mixtures, potash feldspar and aplite. North Carolina...
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FELDSPAR AND NEPHELINE SYENITE
Magazine article from: Mining Engineering; 6/1/2008; ; 700+ words
; U.S. feldspar output sold or used in 2007 was an estimated 700 kt...and 2003. Output included flotation concentrates, feldspar content in feldsparsilica mixtures, potash feldspar and aplite. Residential and commercial construction...
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Feldspar Market Review Includes Future Outlook of the World Feldspar Market.
Newspaper article from: Mining & Minerals; 1/23/2009; 630 words
; ...researchandmarkets.com/research/6b6451/feldspar_market_re) has announced the addition of the Feldspar Market Review report to their offering...report focuses on the study of the global feldspar markets. It provides region analysis...
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Materials handbook.(Feldspar--Microsilica)
Magazine article from: Ceramic Industry; 1/1/2004; 700+ words
; ...minerals in the feldspar group is found pure. Potash feldspars always contain...spar) and soda feldspars always contain...lime spar). Feldspar is found in...pure potash feldspar and 10% to...melting points. Feldspars of different...
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Italian feldspar testwork.
M2 Presswire; 12/19/2002; 700+ words
; ...December 2002-Gippsland: Italian feldspar testwork(C)1994-2002 M2 COMMUNICATIONS...testwork undertaken in Italy in regard to feldspar obtained from the Company's 40 Mt Egyptian Abu Dabbab tantalite-feldspar project. The Abu Dabbab Bankable...
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Understanding K-feldspar ^sup 40^Ar/^sup 39^Ar data: reconciling models, methods and microtextures
Magazine article from: Journal of the Geological Society; 9/1/2007; ; 700+ words
; ...formation of K-feldspar in conjunction with...suggest that K-feldspars will contain a variety...cannot work on any feldspar, given that it...certain proportion of feldspars (Parsons et al...appearance of the feldspar and the shape of...spectrum. klokken feldspars. The Klokken ...
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Systematic destruction of K-feldspar in deeply buried rift and passive margin sandstones
Magazine article from: Journal of the Geological Society; 7/1/2001; ; 700+ words
; ...Systematic patterns of detrital K-feldspar decline with increasing burial depth...the North Sea and USA Gulf Coast. K-feldspar destruction is predominantly by dissolution...porosity ratios. The quantity of K-feldspar destroyed during temperature increase...
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Feldspar
Book article from: World of Earth Science
...x2013; calcium feldspars form a continuum...the plagioclase feldspar series, which...orthoclase or alkali feldspar series. Feldspars containing significant...and plagioclase feldspars cleave along two...right angles. Feldspar nomenclature is...
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alkali feldspar
Book article from: A Dictionary of Earth Sciences
...2 O 8 (calcium feldspar, anorthite, or...apices. The alkali feldspars are represented...host and sodium feldspar occurs within the...In the alkali feldspars, perthitic textures...the plagioclase feldspars . The semi-precious...perthitic alkali feldspar.
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feldspar
Book article from: The Columbia Encyclopedia, Sixth Edition
...Chemically the feldspars are silicates of...these elements. Feldspar is found in association...igneous rocks. Feldspars weather to yield...found in soils. Feldspar crystals are either...The plagioclase feldspars are most commonly...Another form of feldspar, labradorite...
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feldspars
Book article from: A Dictionary of Earth Sciences
feldspars The most important group of rock-forming silicate minerals , including the alkali feldspars KAlSi 3 O 8 to NaAlSi 3 O 8 (K-feldspar to albite ) and the plagioclase feldspars NaAlSi 3 O 8 to CaAl 2 Si 2 O 8 ( albite to...
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plagioclase feldspar
Book article from: A Dictionary of Earth Sciences
plagioclase feldspar One of the most important rock...limestones . These plagioclase feldspars cannot be distinguished from...distinguish them from alkali feldspars . Exsolution of potassium-feldspar in a plagioclase feldspar host...
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