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Feldspar is mined from large granite bodies (called plutons by geologists), from pegmatites (formed when the last fluid stages of a crystallizing granite becomes concentrated in small liquid and vapor-rich pockets that allow the growth of extremely large crystals), and from sands composed mostly of feldspar.
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www.mii.org/Minerals/photofelds.html
www.mii.org/Minerals/photofelds.html
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Historically, feldspar in Virginia was mined for use in the ceramics industry, for abrasives, and for gemstones (amazonite) (Pegau, 1932). Prior to 1907, according to Watson (1907) feldspar was mined primarily in connection with mica mining.
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www.dmme.virginia.gov/DMR3/feldspar.shtml
www.dmme.virginia.gov/DMR3/feldspar.shtml
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Why is feldspar important? ... 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 color may be homogeneous or vary within a single feldspar crystal. Research is currently being conducted on lower quality plagioclase feldspar mined in Arizona to see if gamma radiation will produce a color shift or enhancement.
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www.rockhounds.com/rockshop/feldspar.html
www.rockhounds.com/rockshop/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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Feldspar Uses ... The Feldspar Corporation remains committed to its goal of providing high quality materials at an economical delivered cost. Uses for our feldspar and silica products include glass containers, fiber glass, ... Feldspar is mined at several locations in NSW, including Broken Hill and the northern tablelands.
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jeffcoweb.jeffco.k12.co.us/isu/science/geology/minerals...
jeffcoweb.jeffco.k12.co.us/isu/science/geology/minerals.html
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900,000 t in 1997, the amount of marketed feldspar sold or used in 1998 (table 4), 915,000 t, was similar to that of 1997. Feldspar was mined in seven States, which were, in descending order of output, North Carolina, Virginia, California, Georgia, Oklahoma, Idaho, and South Dakota.
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www.westernminer.com/claims/table/feldsparns.pdf
www.westernminer.com/claims/table/feldsparns.pdf
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Oregon.--The premier U.S. gem-quality feldspar is the red labradorite, known as sunstone, mined in Oregon. Large quantities of gem-quality labradorite, most of it water-clear, straw yellow, or yellow sunstone, has been produced from deposits in southeastern Oregon for many years.
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minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp1...
minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/feldspar.html
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Browse through current listings of feldspar mine & mineral properties for sale, lease, joint venture or option ... Feldspar Canada, ON ... Feldspar and Quartz Mine in Andhra Pradesh, India...
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www.infomine.com/properties/exchange/m66/feldspar.miner...
www.infomine.com/properties/exchange/m66/feldspar.mineral.property.aspx
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