Hambergite (Be2BO3OH) is a beryllium borate mineral named after Swedish explorer and mineralogist Axel Hamberg (1863–1933).

The mineral occurs as white or colorless orthorhombic crystals.

[3][4][2] Hambergite occurs in beryllium bearing granite pegmatites as a rare accessory phase.

It occurs associated with beryl, danburite, apatite, spodumene, zircon, fluorite, feldspar and quartz.

[5] The type locality is Salbutangen, Helgeroa, Langesundsfjorden, Larvik, Vestfold, Norway where it was found in a pegmatite dike of nepheline syenite composition.