Mining in Burundi

#	Item
1 $Refractory metals / Transition metals / Periodic table / Tantalum / Niobium / Oxide minerals / Coltan / Cabot Corporation / Mining industry of Burundi / Chemistry / Matter / Chemical elements$	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 count Add to Reading List Source URL: minerals.usgs.gov Language: English - Date: 1996-11-07 09:53:46 Refractory metals Transition metals Periodic table Tantalum Niobium Oxide minerals Coltan Cabot Corporation Mining industry of Burundi Chemistry Matter Chemical elements
2	Rocks for Crops[removed]Burundi Add to Reading List Source URL: www.uoguelph.ca Language: English - Date: 2002-11-07 11:06:30 Mining in Burundi Economy of Burundi Phosphorite Buyongwe Burundi Cibitoke Rutana Phosphate Chemistry Africa Economic geology