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Metals
HAFNIUM |
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Hafnium carbide is the most refractory binary compound known (melts at 4150 °C). The process of extraction of hafnium is very difficult, having to isolate because it is found in zirconium minerals. Production is concentrated in Australia and South Africa and the toal annual world is about 65 tons.
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Hafnium is shiny and silvery. When powder, ignites spontaneously on contact with air. It is used alloyed with 
