Borate minerals often have the polycrystalline nature, so it seems to be useful determining conditions of their synthesis, with recovering of their monocrystalline specimens, by the way to study the structure of those minerals. Hydrothermal synthesis is quite purposeful for modeling the natural borate mineralization within exogenic systems. This paper displays results of the pandermite recrystallization at hydrothermal conditions under +260 deg C and 20 bar pressure. The obtained crystals were investigated by X-ray analysis and IR-spectroscopy. Identification of the powder pattern has shown the close similarity of studied specimen to the natural Ca-borate - korzhinskite. Contrary to korzhinslcite, the IR spectrum didn't prove the presence of H_2O molecules in the synthesized compound. So, it should be assumed that the obtained compound is intermediate member between korzhinskite and calciborite, CaB_2O_4.
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