![]() This behavior seems to follow Ostwald's rule, in which the least stable polymorph crystallizes first, followed by the crystallization of different polymorphs via a sequence of increasingly stable phases. In additive-free aqueous solutions, calcite forms easily as the major product, while aragonite appears only as a minor product.Īt high saturation, vaterite is typically the first phase precipitated, which is followed by a transformation of the vaterite to calcite. Crystallization Crystal Structure of Calcite and AragoniteĪll three polymorphs crystallize simultaneously from aqueous solutions under ambient conditions.
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