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Niobium
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221 $Refractory metals / Transition metals / Periodic table / Oxide minerals / Tantalum / Niobium / Coltan / Ore / Cabot Corporation / Chemistry / Matter / Chemical elements$	COLUMBIUM (NIOBIUM) AND TANTALUM By Larry D. Cunningham Columbium (niobium-Nb) is vital as an alloying element in steels and in superalloys for aircraft turbine engines and is in greatest demand in industrialized countri Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1997-09-04 14:42:45 Refractory metals Transition metals Periodic table Oxide minerals Tantalum Niobium Coltan Ore Cabot Corporation Chemistry Matter Chemical elements
222 $Refractory metals / Transition metals / Tantalum / Niobium / Carbides / Defense National Stockpile Center / Coltan / Chemistry / Matter / Chemical elements$	164 TANTALUM (Data in metric tons of tantalum content unless otherwise noted) Domestic Production and Use: No significant U.S. tantalum mine production has been reported since[removed]Domestic tantalum resources are of lo Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2007-01-19 09:38:50 Refractory metals Transition metals Tantalum Niobium Carbides Defense National Stockpile Center Coltan Chemistry Matter Chemical elements
223 $Transition metals / Refractory metals / Tantalum / Niobium / Scrap / Hafnium / Ore / Coltan / Matter / Chemistry / Chemical elements$	162 TANTALUM (Data in metric tons of tantalum content unless otherwise noted) Domestic Production and Use: No significant U.S. tantalum mine production has been reported since[removed]Domestic tantalum resources are of lo Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2012-01-24 14:47:19 Transition metals Refractory metals Tantalum Niobium Scrap Hafnium Ore Coltan Matter Chemistry Chemical elements
224	190 ZIRCONIUM AND HAFNIUM (Data in metric tons, unless otherwise noted) Domestic Production and Use: Zircon sand was produced at two mines in Florida and at one mine in Virginia. A new mine was expected to begin operati Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2004-01-13 14:05:44 Transition metals Zirconium Hafnium Zircon Niobium Baddeleyite Heavy mineral sands ore deposits Group 4 element Matter Chemistry Chemical elements
225	190 ZIRCONIUM AND HAFNIUM (Data in metric tons unless otherwise noted) Domestic Production and Use: The zirconium-silicate mineral zircon is produced as a coproduct from the mining and processing of heavy minerals. Typi Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2013-01-29 12:27:19 Transition metals Zirconium Hafnium Zircon Niobium Baddeleyite Group 4 element Matter Chemistry Chemical elements
226	192 ZIRCONIUM AND HAFNIUM (Data in metric tons, unless otherwise noted) Domestic Production and Use: Zircon sand was produced at two mines in Florida and one mine in Virginia. Zirconium and hafnium metal were produced f Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1999-05-12 13:23:28 Transition metals Hafnium Zirconium Zircon Niobium Neutron capture Control rod Baddeleyite Group 4 element Matter Chemistry Chemical elements
227 $Transition metals / Refractory metals / Tantalum / Capacitors / Niobium / Aluminium / Ore / Hafnium / Tantalite / Chemistry / Matter / Chemical elements$	170 TANTALUM (Data in thousand kilograms of tantalum content, unless otherwise noted) Domestic Production and Use: There has been no significant domestic tantalum-mining industry since 1959, with the exception of small Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1997-03-10 08:33:39 Transition metals Refractory metals Tantalum Capacitors Niobium Aluminium Ore Hafnium Tantalite Chemistry Matter Chemical elements
228 $Transition metals / Refractory metals / Niobium / Tantalum / Coltan / Ferroalloy / Steel / Nickel / Superalloy / Chemistry / Matter / Chemical elements$	52 COLUMBIUM (NIOBIUM) (Data in metric tons of columbium content, unless otherwise noted) Domestic Production and Use: There has been no significant domestic columbium mining since[removed]Domestic columbium resources are Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2004-01-13 09:32:10 Transition metals Refractory metals Niobium Tantalum Coltan Ferroalloy Steel Nickel Superalloy Chemistry Matter Chemical elements
229	188 ZIRCONIUM AND HAFNIUM (Data in metric tons unless otherwise noted) Domestic Production and Use: The zirconium-silicate mineral zircon is produced as a coproduct from the mining and processing of heavy minerals. Typi Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2014-03-07 17:30:56 Transition metals Economic geology Nesosilicates Gemstones Hafnium Zircon Heavy mineral sands ore deposits Niobium Baddeleyite Chemistry Matter Chemical elements
230	184 VANADIUM (Data in metric tons of vanadium content unless otherwise noted) Domestic Production and Use: Eight U.S. firms that make up the domestic vanadium industry produced ferrovanadium, vanadium pentoxide, vanadiu Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 2006-01-19 09:40:43 Chemical elements Transition metals Vanadium Ferroalloy Titanium alloy Alloy steel Oxide Niobium Tool steel Chemistry Matter Steels

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