Some of the most dramatic of these formations can be seen in Thailand's Phangnga Bay and Halong Bay in Vietnam.
Ta verižna reakcija je::H2S + 2 O2 → H2SO4 (sulfide oxidation):H2SO4 + 2 H2O → SO42− + 2 H3O+ (sulfuric acid dissociation):CaCO3 + 2 H3O+ → Ca2+ + H2CO3 + 2 H2O (calcium carbonate dissolution):CaCO3 + H2SO4 → CaSO4 + H2CO3 (global reaction leading to calcium sulfate):CaSO4 + 2 H2O → CaSO4 • 2 H2O (hydration and gypsum formation)Ta reakcija ustvarja sadro.