Chemical formula of siderite is

✅Explanation:
-Siderite is an iron carbonate mineral.
-Its chemical formula, FeCO₃, indicates one iron (Fe) atom bonded to one carbonate (CO₃) group.

📌 Other Options Explanations:
-(a) CaCO₃
-This is the chemical formula for calcite, a calcium carbonate mineral commonly found in limestone and marble.
-(b) Fe₂O₃
-This represents hematite, an iron oxide mineral and a major source of iron ore
-(c) Ca₃(PO₄)₂
-This is the chemical formula for calcium phosphate, a major component of bones and teeth. It's also found in some mineral deposits like apatite.

🛑Additional Information:-
-FeCO3 is the chemical formula of Siderite.
-It is a mineral composed of Iron Carbonate.
-FeS2 is the chemical formula of Iron Pyrite.
-Fe2O3 is the chemical formula of Hematite.
-Fe3O4 is the chemical formula of Magnetite.