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Dominant species
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Hambergite
Hambergite
Chemical
Formula
Be2BO3OH
Species
Borates
Crystal
System
Orthorhombic
Mohs
Scale
7
Specific
Gravity
2.347-2.372
Color
Colorless, pale gray, pale yellow
Streak
White
Luster
Vitreous
Refractive
Index
n = 1.554 - 1.560 n = 1.587 - 1.591 n = 1.628 - 1.631
Diaphaneity
Transparent, Translucent
Cleavage
PerfectOn ; on good.
Crystal Habit:Prismatic crystals
Geological Setting:Alkali-rich pegmatites (Madagascar); gem gravels (Kashmir).
Hambergite (Be2BO3OH) is a beryllium borate mineral named after Swedish explorer and mineralogist Axel Hamberg. The mineral occurs as white or colorless orthorhombic crystals.

Occurrence

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.

It was first described by mineralogist and geographer W. C. Br?gger in 1890. The type locality is Salbutangen, Helgeroa, Langesundsfjorden, Larvik, Vestfold, Norway where it was found in a pegmatite dike of nepheline syenite composition.


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