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In which of the following minerals is iron NOT present in the form of a sulphide?

1. Fool's gold
2. Siderite
3. Chalcopyrite
4. Limonite

Correct answer: Siderite

Solution

Fool's gold (FeS2), Chalcopyrite (CuFeS2) are iron sulphides. Limonite (Fe2O3.xH2O) is an oxide. Siderite (FeCO3) is an iron carbonate, so iron is NOT in sulphide form in siderite.

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