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51	2008 Minerals Yearbook FELDSPAR U.S. Department of the Interior U.S. Geological Survey Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2012-08-15 09:14:11 Igneous rocks Economic geology Feldspathoid Nepheline syenite Tectosilicates Unimin Industrial mineral Feldspar Leucite Petrology Crystallography Igneous petrology
52	62 FELDSPAR (Data in thousand metric tons unless otherwise noted) Domestic Production and Use: U.S. feldspar production in 2005 had an estimated value of about $44 million. The three leading producers accounted for abou Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2006-01-18 13:31:31 Tectosilicates Igneous petrology Nepheline syenite Granite Mica Recycling Petrology Crystallography Feldspar
53	FELDSPAR AND NEPHELINE SYENITE By Michael J. Potter Feldspar Feldspars are alumino-silicates with varying amounts of sodium, potassium, or calcium. In glassmaking, the largest end use, feldspar provides alumina for impro Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1997-07-21 07:10:39 Economic geology Nepheline syenite Industrial mineral Tectosilicates Unimin Aplite Syenite Pegmatite Feldspar Petrology Igneous petrology Igneous rocks
54	Mineral Commodity Summaries[removed]Feldspar Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2002-02-13 13:35:12 Igneous petrology Feldspar Tectosilicates Granite Nepheline syenite Mica Ceramic Glass Recycling Petrology Crystallography Dielectrics
55	FELDSPAR AND NEPHELINE SYENITE By Michael J. Potter Feldspar Feldspars are alumino-silicates with varying amounts of sodium, potassium or calcium. In glassmaking, feldspar provides alumina for improving hardness, durabil Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1996-11-07 09:55:09 Igneous rocks Tectosilicates Nepheline syenite Industrial mineral Unimin China stone Aplite Feldspar Syenite Petrology Chemistry Igneous petrology
56	62 FELDSPAR (Data in thousand metric tons, unless otherwise noted) Domestic Production and Use: U.S. feldspar production in 2002 had an estimated value of about $46 million. The three largest producers accounted for abo Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2003-02-11 10:50:36 Dielectrics Igneous petrology Feldspar Tectosilicates Nepheline syenite Granite Glass Mica Aluminium Petrology Chemistry Crystallography
57	FELDSPAR AND NEPHELINE SYENITE By Michael J. Potter Feldspar Feldspars are alumino-silicates having varying amounts of sodium, potassium, or calcium. In glassmaking, the largest end use, feldspar provides alumina for imp Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2000-01-31 09:55:01 Nepheline syenite Tectosilicates Unimin Feldspar Industrial mineral Syenite Aplite Ceramic Potash Petrology Igneous petrology Crystallography
58	58 FELDSPAR (Data in thousand metric tons, unless otherwise noted) Domestic Production and Use: U.S. feldspar production in 2000 had an estimated value of about $42 million. The three largest producers accounted for abo Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2001-02-01 11:03:59 Feldspar Tectosilicates Nepheline syenite Granite Glass Ceramic Petrology Crystallography Igneous petrology
59	56 FELDSPAR (Data in thousand metric tons, unless noted) Domestic Production and Use: U.S. feldspar production (including aplite) in 1995 had an estimated value of $32 million. The three largest producers accounted for Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2004-03-24 10:34:20 Feldspar Tectosilicates Nepheline syenite Granite Mica Petrology Crystallography Igneous petrology
60	2010 Minerals Yearbook FELDSPAR AND NEPHELINE SYENITE [ADVANCE RELEASE] U.S. Department of the Interior U.S. Geological Survey Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2012-07-25 13:50:43 Igneous rocks Tectosilicates Nepheline syenite Unimin Feldspar Industrial mineral Leucite China stone Aplite Petrology Crystallography Igneous petrology

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