carbonates

Carbonates of iron, sodium, calcium, and calcium/magnesium:

Composition	Formula	Mineral name	Rock
iron carbonate	FeCO3	siderite	ironstone
sodium bicarbonate	NaHCO3	baking soda	nahcohlite
calcium carbonate	CaCO3	calcite	limestone
calcium, magnesium carbonate	(Ca, Mg)CO3	dolomite	dolostone