Temperature [˚C]	Gibbs free enthalpy [kcal]
Temperature [˚C]	MnCO₃ = MnO + CO₂	2MnO + O₂ = 2MnO₂	6MnO + O₂ = 2Mn₃O₄	4MnO + O₂ = 2Mn₂O₃
0	13.603	−50.195	−94.669	−75.573
100	9.596	−44.965	−89.113	−70.264
200	5.619	−39.729	−83.533	−64.965
300	1.688	−34.522	−77.965	−59.669
400	−2.195	−29.351	−72.425	−54.392
500	−6.029	−24.214	−66.922	−49.144
600	−9.815	−19.105	−61.462	−43.937
700	−13.552	−14.014	−56.051	−38.777
800	−17.240	−8.932	−50.691	−33.673
900	−20.879	−3.848	−45.387	−28.629
1000	−24.468	1.250	−40.141	−23.65
Temperature [˚C]	Gibbs free enthalpy [kcal]
Temperature [˚C]	Mn₃O₄ + O₂ = 3MnO₂	2Mn₂O₃ + O₂ = 4MnO₂	MgCO₃ = MgO + CO₂	CaCO₃ = CaO + CO₂
0	−27.958	−24.817	12.649	32.13
100	−22.891	−19.665	8.457	28.313
200	−17.827	−14.493	4.293	24.543
300	−12.801	−9.375	0.172	20.824
400	−7.815	−4.311	−3.9	17.156
500	−2.861	0.715	−7.914	13.537
600	2.073	5.727	−11.866	9.965
700	7.004	10.749	−15.751	6.44
800	11.947	15.808	−19.563	2.96
900	16.922	20.932	−23.299	−0.475
1000	21.945	26.150	−26.842	−3.864