Formation Process of Calcium Carbonate Polymorphs : Classical or Non-classical Pathway?(<Special Issue>Formation and Crystal Growth of Metastable Phases)

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  • Kawano Jun
    Creative Research Institution (CRIS), Hokkaido University

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  • 炭酸カルシウム多形の形成過程 : Classical or Non-classical Pathway?(<特集>準安定相の形成と結晶成長)
  • 炭酸カルシウム多形の形成過程 : Classical or Non-classical Pathway?
  • タンサン カルシウム タケイ ノ ケイセイ カテイ : Classical or Non-classical Pathway?

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Calcium carbonate, CaCO_3, occurs in six different forms: three crystalline polymorphs (calcite, aragonite, and vaterite), two hydrate phases, and amorphous calcium carbonate (ACC). These polymorphs are important both in the earth science, as rock-forming minerals, and in chemical technology, as raw materials for industrial processes. Furthermore, the occurrence of CaCO_3 in living organisms has received considerable attention. Therefore formation process of these polymorphs has been extensively investigated, however our knowledge is far from complete. In the present paper, we review how the formation process of CaCO_3 has been described in literatures, including a discovery that crystallization occurs through non-classical mechanism such as stable prenucletaion cluster aggregation (Gebauer et al.: Science, 322, 1819), which give a new picture of the early stages of calcium carbonate growth.

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