141![Mineral Commodity Summaries[removed]Feldspar Mineral Commodity Summaries[removed]Feldspar](https://www.pdfsearch.io/img/c0edd2803075156510ea8e0a1cbd48db.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-13 13:35:12
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142![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 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](https://www.pdfsearch.io/img/16d58c7527ce531799fff7fd76b20d0d.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-11-07 09:55:09
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143![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 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](https://www.pdfsearch.io/img/faf61255100d76b8a9230d4bb005d351.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 10:50:36
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144![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 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](https://www.pdfsearch.io/img/893424c7071314e2636b71c4c0756db3.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-01-31 09:55:01
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145![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 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](https://www.pdfsearch.io/img/0320fb04301483e68395cbc6bdeb02bf.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 11:03:59
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146![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 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](https://www.pdfsearch.io/img/824bcda58fd8c8804f27232dcfbbe2b3.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 10:34:20
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147![2010 Minerals Yearbook FELDSPAR AND NEPHELINE SYENITE [ADVANCE RELEASE] U.S. Department of the Interior U.S. Geological Survey 2010 Minerals Yearbook FELDSPAR AND NEPHELINE SYENITE [ADVANCE RELEASE] U.S. Department of the Interior U.S. Geological Survey](https://www.pdfsearch.io/img/78aba99d32e2626a2a37a6819e1b7f74.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-07-25 13:50:43
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148![2007 Minerals Yearbook FELDSPAR AND NEPHELINE SYENITE U.S. Department of the Interior U.S. Geological Survey 2007 Minerals Yearbook FELDSPAR AND NEPHELINE SYENITE U.S. Department of the Interior U.S. Geological Survey](https://www.pdfsearch.io/img/3982a688f32be5a0f59c71f1cd810d29.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-28 13:40:42
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149![60 FELDSPAR (Data in thousand metric tons, unless otherwise noted) Domestic Production and Use: U.S. feldspar production in 2003 had an estimated value of about $44 million. The three largest producers accounted for abo 60 FELDSPAR (Data in thousand metric tons, unless otherwise noted) Domestic Production and Use: U.S. feldspar production in 2003 had an estimated value of about $44 million. The three largest producers accounted for abo](https://www.pdfsearch.io/img/057642eb7b716a0ddce1afc705cabec2.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 09:51:20
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150![Feldspar and nepheline syenite in 2001 Feldspar and nepheline syenite in 2001](https://www.pdfsearch.io/img/f4767a12d943c0bf718c546741791a6c.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-07-17 14:14:34
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