Malachite just needs to be mixed with one more component!
Attention! All experiments are performed by professionals. Do not attempt.
When sulfuric acid is added, malachite dissolves, forming copper(II) sulfate, water, and carbon dioxide. Carbon dioxide does not facilitate combustion, so it can extinguish a candle! When malachite is heated to a high temperature, black copper(II) oxide and water vapor form. This releases carbon dioxide again – that's why we see it bubbling!