Siderite is a mineral composed of iron II carbonate FeCO 3 It takes its name from the Greek word σίδηρος sideros iron It is a valuable iron mineral since it is 48 iron and contains no sulfur or phosphorus Zinc magnesium and manganese commonly substitute for the iron resulting in the sideritesmithsonite sideritemagnesite and sideriterhodochrosite solid solution series
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