Mining in Burundi
Results: 2
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1![]() | 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 countAdd to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-11-07 09:53:46 |
2![]() | Rocks for Crops[removed]BurundiAdd to Reading ListSource URL: www.uoguelph.caLanguage: English - Date: 2002-11-07 11:06:30 |