Hydroboracite is a hydrated borate mineral (hence the name) of calcium and magnesium, whose chemical composition is CaMgB₆O₈(OH)₆·3H₂O. It was discovered in 1834 in the Inder (lake), Inder lake, Atyrau Province, Kazakhstan. Hydroboracite is a minor borate ore mineral.

References

{{mineral-stub Inoborates Monoclinic minerals Minerals in space group 13