What is known as blue gold?
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Coltan is Venezuela's Oro Azul or 'blue gold'. The price of this blue gold follows an increasing demand for a high-grade metal known as tantalum, processed from refined coltan. Demand for coltan is so intense, it fetches a higher price on the international market than even gold or diamonds.
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Blue gold is a gold alloy with indium — AuIn2, containing 46% of 11-carat gold and 54% . The blue intermetallic compound is very fragile. The compound of gold and gallium — AuGa2 has a lighter bluish hue and contains 58% of 14K gold.
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