Feldspar - Wikipedia, the free encyclopedia
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Feldspars (KAlSi 3 O 8 - NaAlSi 3 O 8 - CaAl 2 Si 2 O 8 ) are a group of rock-forming tectosilicate minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize fro...
en.wikipedia.org/wiki/Feldspar
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Plagioclase is well displayed in a gravestone. ... Plagioclase tends to be more transparent than alkali feldspar; it also very commonly shows striations on its cleavage faces that are caused by multiple crystal twinning within grains. These appear as the lines in this polished specimen. ... Labradorite - Plagioclase Feldspar...
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geology.about.com/od/minerals/ig/feldspars/plaganortho....
geology.about.com/od/minerals/ig/feldspars/plaganortho.htm
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Minerals & Gemstones ... The plagioclase variety called labradorite can display a dramatic blue internal reflection, called labradorescence. ... Photo (c) 2007 Andrew Alden, licensed to About.com...
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geology.about.com/od/minerals/ig/feldspars/labsparback....
geology.about.com/od/minerals/ig/feldspars/labsparback.htm
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Information on the plagioclase feldspar solid solution series ... LAGIOCLASE FELDSPAR Feldspar Group ... P Series;; plagioclase feldspar - mineral #15AB6...
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www.minerals.net/mineral/silicate/tecto/feldspar/plagio...
www.minerals.net/mineral/silicate/tecto/feldspar/plagiocl.htm
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Information on the plagioclase feldspar mineral labradorite ... Plagioclase Feldspar Group ... The ratio of sodium to calcium is about 7:3. The amount of aluminum atoms are between 1 and 2, and the amount of silicon atoms are between 3 and 2. In the Plagioclase Feldspar series, Labradorite contains between 30 and 50 percent...
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www.minerals.net/mineral/silicate/tecto/feldspar/labrad...
www.minerals.net/mineral/silicate/tecto/feldspar/labrador.htm
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Often, feldspars are simply referred to as plagioclase and orthoclase (a K-feldspar) because identification to greater precision is difficult with ordinary methods.
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www.galleries.com/Minerals/silicate/feldspar.htm
www.galleries.com/Minerals/silicate/feldspar.htm
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plagioclase feldspar – Facts about plagioclase feldspar, pictures, video, and plagioclase feldspar information at Encyclopedia.com: a free, credible collection of encyclopedias. ... plagioclase feldspar : see feldspar .
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www.encyclopedia.com/doc/1E1-X-plagiocl.html
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One of these elements is usually dominant, but most of the feldspars contain all 3 in varying amounts. It is the proportions of these 3 elements which help determine which specific feldspar is formed. The feldspars are divided into 2 broad categories: plagioclase, which contains calcium and sodium;
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jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry34.html
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General Plagioclase Information ... Plagioclase Image ... Plagioclase Crystallography...
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webmineral.com/data/Plagioclase.shtml
webmineral.com/data/Plagioclase.shtml
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