Hexahydroborite

Hexahydroborite is a mineral composed of calcium, boron, oxygen, and hydrogen, with formula CaB2H12O6, more precisely [Ca2+]([B(OH4)]−)2·2H2O.[1][2]

Hexahydroborite is the end member of a series of natural metaborates with the general formula CaB2O4·nH2O or CaO·B2O3·nH2O with n varying from 0 to 6, the other end member being anhydrous calciborite CaB2O4.[3][4]

The anion in the structure is tetrahydroxyborate, [B(OH4)]−. The name comes from an interpretation of the formula as CaBO3·6H2O.

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