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The gemstone Saphire is an impure form of alumina having impurity of

$ (a)\;\text{Nickel} \\(b)\;\text{Cobalt.} \\(c)\;\text{Manganese} \\ (d)\;\text{Tin} $
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The coloration of stone is because of impurity.
Hence b is the correct answer.
answered Mar 20, 2014 by meena.p

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