Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
ISSN-L : 1345-6296
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Transformation process of amorphous magnesium carbonate in aqueous solution
Jun–ya TANAKAJun KAWANOTakaya NAGAIHenry TENG
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2019 Volume 114 Issue 2 Pages 105-109

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Abstract

Amorphous magnesium carbonate (AMC) is an important phase in the early formation stage of magnesium carbonate. In this study, precipitation experiments were conducted to clarify the formation and transformation process of AMC in aqueous solution. Fine AMC particles precipitated, immediately after mixing of Na2CO3 and MgCl2 solutions. Chemical composition of the AMC was determined to be approximately MgCO3·2H2O although two hydration states were expected to exist for AMCs. Subsequently, the AMC transformed in aqueous solutions into needle–like crystals of nesquehonite (MgCO3·3H2O), eventually to tiny polycrystalline particles of dypingite [Mg5(CO3)4(OH)2·5H2O] via a solvent–mediated processes.

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© 2019 Japan Association of Mineralogical Sciences
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