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  • ColtanColtan

    Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metalli...

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  • CassiteriteCassiterite

    Cassiterite is a tin oxide mineral, SnO2. It is generally opaque, but it is translucent in thin crystals....

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  • TungstenTungsten

    Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. The name tungsten com...

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