R4: Mineral sciences of the Earth surface

[R4-07] Solubility of calcium carbonate hemihydrate : Implication for prediction of water chemistry of alkaline lakes

[Presentation award entry]

*Mai Suyama¹, Keisuke Fukushi², Takuma Kitajima¹ (1. Kanazawa Uni. Sci., 2. Institute of Nature and Environmental Technology, Kanazawa University)

Keywords:Calcium carbonate hemihydrate, precursor, solubility, ion activity products, alkaline lakes

Calcium carbonate hemi hydrate (CCHH, CO₃･1/2H₂O) was recently synthesized by Zou et al. (2019). It has not yet been discovered in the natural environment. Solubility is an indicator to compare the relationship between the aqueous environment and CCHH in terms of the possibility of existence in nature. Therefore, the purpose of this study is to experimentally determine the solubility of CCHH.