FeCaCO3

FeCaCO3 is a hypothetical chemical compound that combines iron (Fe), calcium (Ca), and carbonate (CO3) ions. In a stable chemical structure, iron typically exists in its +2 or +3 oxidation state, while calcium is almost always found in its +2 oxidation state. Carbonate is a polyatomic anion with a charge of -2. For a compound like FeCaCO3 to form, there would need to be a specific stoichiometry and arrangement of these ions that satisfies the overall charge neutrality. A simple ionic compound involving these elements might be expected to have a formula reflecting the charges, such as Fe(CO3) or Ca(CO3), which are known compounds (iron(II) carbonate and calcium carbonate, respectively). The combination of iron and calcium within the same carbonate structure, particularly in a single formula unit, is not commonly observed in naturally occurring minerals or synthesized compounds. While mixed cation carbonates exist, such as dolomite (CaMg(CO3)2), the specific combination of iron and calcium in a simple FeCaCO3 formula is not a recognized mineral or chemical substance. Further investigation into hypothetical structures or specific complex formations would be required to explore any potential existence or properties of such a compound.