Miss Armit: Perfect. Calcium carbonate needs to be heated up to eight hundred twenty degrees to start its decomposition. What you think it will break down into, then? Gethin: So many questions.

To make concrete, limestone, or calcium carbonate, is mixed with clay and other materials and then calcined at high temperatures, so CO2 is released via the thermal decomposition of calcium carbonate.

CALCIUM carbonate can exist in three polymorphic forms, which in the order of their usual stabilities are calcite, aragonite and vaterite. Calcite is the most stable and the least soluble ...