Formation of aragonite from amorphous, gelatinous CaCO 3 and CaCO 3 · H 2 O precipitated in the solution containing Mg 2+ ion was investigated. Amorphous CaCO 3 was converted to aragonite via CaCO 3 · H 2 O formation on drying in air. The stability of CaCO 3 · H 2 O in air depended on how long it has been immersed in the mother solution. Effect of Mg 2+ ion on the formation of aragonite was discussed on the basis of surface energy of a small particle.
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Kamiya et al. (1977) studied this question.
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