. Siderite is an ore of
Siderite is a mineral composed of iron (II) carbonate (FeCO3).
It is a widespread mineral that is an ore of iron.
The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metallic veins (as gangue, or waste rock).
Siderite is an ore of Fe. Hence, option D is correct.