| cellpadding="2" cellspacing="0" | H2O || + || CO2 || → || colspan="3" | H2CO3 |- | CaCO3 || + || H2CO3 || → || Ca2+ || + || 2 | | cellpadding="2" cellspacing="0" | H2S || + || 2 O2 || → | colspan="5" | H2SO4 || (sulfide oxidation) |- | H2SO4 || + || 2 H2O || → | || + || colspan="3" | 2 H3O+ || (sulfuric acid dissociation) |- | CaCO3 || + || 2 H3O+ || → | Ca2+ || + || H2CO3 || + || 2 H2O || (calcium carbonate dissolution) |- | Ca2+ || + || SO42- || → | CaSO4 || || colspan="3" | || (formation of calcium sulfate) |- | CaSO4 || + || 2 H2O || → | colspan="5" | CaSO4 · 2 H2O || (formation of gypsum) |
 H2O + CO2 → H2CO3 CaCO3 + H2CO3 → Ca2+ + 2 H2S + 2 O2 → H2SO4 (sulfide oxidation) H2SO4 + 2 H2O → + 2 H3O+ (sulfuric acid dissociation) CaCO3 + 2 H3O+ → Ca2+ + H2CO3 + 2 H2O (calcium carbonate dissolution) Ca2+ + SO42- → CaSO4 (formation of calcium sulfate) CaSO4 + 2 H2O → CaSO4 · 2 H2O (formation of gypsum) 
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