Occasionally, enrichment in the unusual trace elements will result in crystallisation of equally unusual and rare minerals such as beryl, tourmaline, columbite, tantalite, zinnwaldite and so forth.
32.
Coltan _ short for columbite-tantalite _ sells at $ 23 a pound on the international market and is used in the manufacture of computer chips and other high-tech gadgets.
33.
Congo has vast deposits of key minerals, including diamonds, copper, cobalt, gold and coltan _ a natural alloy of columbite and tantalite used to manufacture high-tech electronics.
34.
Nigeria also has a wide array of underexploited mineral resources which include natural gas, coal, bauxite, tantalite, gold, tin, iron ore, limestone, niobium, lead and zinc.
35.
The tiny stones are columbite-tantalite, or coltan, which is vital in the production of power-storing components for high-tech gear ranging from nuclear reactors to cell phones to PlayStations.
36.
The problem was made worse by widespread, small-scale mining for gold, precious stones and columbine tantalite _ which is used in the manufacture of cell phones and other high-tech gadgets.
37.
It is chemically similar to " columbite ", and the two are often grouped together as a semi-singular mineral called coltan or " columbite-tantalite " in many mineral guides.
38.
In 2005, production increased to 42, 592 kg and has continued to rise again and columbite-tantalite production accounted for 5 % of the value of Burundi s mineral production as of 2005.
39.
In World War II her tantalum was used in developing radar; the need for it became so obvious to the previously reluctant Commonwealth government that it resumed Tantalite Ltd for the duration of the war.
40.
Mining operations in the Pilbara preceded those at Coolgardie with gold, tin, lead, zinc, tantalite, antimony and bismuth being among the minerals chipped from the Pilbara rocks and sands during this period.
