Hexahydroborite

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

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.

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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