Abstract

Chloropinnoite, 2MgO·2B2O3·MgCl2·14H2O, was a new borate, obtained from the natural concentrated salt lake brine in Qinghai–Xizang Plateau, P. R. China. The phase transitions from chloropinnoite dissolved in water and boric acid solution would strongly consist of magnesium borate minerals deposited in a salt lake of China. The obtained results from phase relations and kinetic mechanism of chloropinnoite–water/boric acid system would further propose a new geochemical hypothesis for hydrated magnesium borate deposition. The chloropinnoite was diluted by rich boric acid or solution, and it would accelerate the phase transition of chloropinnoite into other borates, which would explain well the geochemical formation of hydrated borate minerals deposited in Qinghai–Xizang Plateau, China.

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