Here's why:

* Carbonates are salts containing the carbonate ion (CO₃²⁻).

* Sulfur is a non-metal and typically forms sulfide ions (S²⁻) or sulfates (SO₄²⁻).

To form a stable compound, the positive and negative charges need to balance. Sulfur and carbonate ions do not readily combine to form a neutral compound.

It's possible you might be thinking of a different compound. Could you clarify your request?