An aragonite sea contains aragonite and high-magnesium calcite as the primary inorganic calcium carbonate precipitates. The reason lies in the highly hydrated Mg2+ divalent ion, the second most abundant cation in seawater after Na+, known to be a strong inhibitor of CaCO3 crystallization at the nucleation stage.
An aragonite sea contains aragonite and high-magnesium calcite as the primary inorganic calcium carbonate precipitates. The reason lies in the highly hydrated Mg2+ divalent ion, the second most abundant cation in seawater after Na+, known to be a strong inhibitor of CaCO3 crystallization at the nucleation stage.
Source: Wikipedia "Aragonite sea" · CC BY-SA 4.0
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