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The feldspars are a family of silicate minerals which occur in igneous rocks. There are many different members to the feldspar group. Obviously, silicon and oxygen form the foundation for the group, but calcium, sodium, and potassium are also present.
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jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry34.html
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The word feldspar literally translates to: feld, meaning field, and spar, meaning "easily cleaved material". It refers to any of several crystalline aluminosilicate minerals found in abundance ... Most feldspars crystallize from a melt in igneous rocks. Their crystals are tabular, flattened and most are complexly twinned.
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www.rockhounds.com/rockshop/feldspar.html
www.rockhounds.com/rockshop/feldspar.html
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The feldspar group is a fairly large group with nearly 20 members recognized, but only nine are well known and ... Some feldspars may be triboluminescent. They have two directions of cleavage at nearly right angles. Feldspars also tend to crystallize in igneous enviroments, but are also present in many metamorphic rocks.
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www.galleries.com/minerals/Silicate/FELDSPAR.htm
www.galleries.com/minerals/Silicate/FELDSPAR.htm
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Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock. ... Print Email Bookmark...
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www.sciencedaily.com/articles/f/feldspar.htm
www.sciencedaily.com/articles/f/feldspar.htm
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the feldspars make up the major constituent of many igneous and metamorphic rocks, they form at medium to high temperature and at some depth. Microcline can form in granite pegmatites and at ... Sunstone is a species of plagioclase called "oligoclase" or known sometimes in the jewelry industry as "adventurine feldspar".
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www.theimage.com/gemstone/feldspar/feldspar.html
www.theimage.com/gemstone/feldspar/feldspar.html
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Mineral Information on the WEB ... The generic term "feldspar" comes from the Germanic term "feldt spat", meaning "mineral with prominent cleavage from the field". It was a prime constituent of many of the rocks over turned by farmers while plowing their fields.
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www.theimage.com/mineral/feldspar/index.htm
www.theimage.com/mineral/feldspar/index.htm
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Physical Properties of Rocks: Plasticity, diffusion, and creep ... Microstructures show pronounced cavitation and formation of porosity bands containing redistributed glass, presumably associated with grain boundary sliding and shape-preferred orientation of high-aspect ratio feldspar grains.
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www.agu.org/pubs/crossref/2008/2007GL032478.shtml
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Blueschist-facies rocks with jadeite-K-feldspar-lawsonite paragenesis occur as exotic blocks in Miocene debris flows in the blueschist belt of northwest Turkey. The jadeite-K-feldspar rocks have a very fine grain size and although recrystallized locally retain a relict porphyritic volcanic texture.
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minmag.geoscienceworld.org/cgi/content/abstract/61/6/83...
minmag.geoscienceworld.org/cgi/content/abstract/61/6/835
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One example of the feldspar class of minerals is orthoclase. The other feldspar mineral is called "plagioclase". ... There are many different minerals which make up the rocks of which the planets are formed.
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www.windows.ucar.edu/earth_science/geology/rocks/feldsp...
www.windows.ucar.edu/earth_science/geology/rocks/feldspar.html
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