CuFeS2 or Cu2S whats the formula of copper pyrite, because in text at one place its written as CuFeS2 and at another place its written as Cu2S. Plz reply fast or if both r right???

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Cu2s is cuperus sulfide
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CuFeS2 i.e.copper iron sulfide.
It has brassy to golden yellow color.
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Cufes2 is the formula of copper pyrites
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