Hambergite is a mineral with a hardness of 8 out of 10 on the Mohs scale of mineral hardness [?]. These Orthorhomibicly structured gems are made of beryllium hydroxyborate, their full chemical compound being Be2(OH)BO3.

Hambergite is a beryllium borate mineral in the classification of Nitrates, Carbonates, and Borates and is an extremely rare gemstone.

It occurs as transparent colourless orthorhombic prismatic crystals which are usually well crystallized, sometimes twinned. Its colors range to white, white grayish, and yellowish white.

Crystals are striated along the prisms. It is very hard and has one direction of perfect cleavage. It has a vitreous luster and resembles glass or quartz when cut. It has strong birefringence, much higher than zircon, and can take a good polishing.

Hambergite occurs as a rare accessory mineral in granite pegmatites with beryllium, and in alluvial gem deposits. It is associated with danburite, spodumene, apatite, beryl, feldspar, fluorite, zircon, quartz. These are found in Kashmir (India), Madagascar, the Czech Republic, Romania, USA, and Norway. Ornamental quality material usually comes from Anjanabanoana, Madagascar.

The specific gravity [?] for Hambergite is 2.35, it's refractive index [?] is 1.55-1.63, and it's double refraction [?] is 0.072.


Hambergite is named after a Swedish mineralogist Axel Hamberg.

Industrial Usages

Hambergite has the lowest density of any gem with high birefringence, meaning a bigger stone will not carry a lot of weight, but will still have the play of light that one would expect from uniaxial birefringent materials such as calcite, quartz or zircon (which all have high density).

You May Also Like...

Achroite Tourmaline

Achroite Tourmaline: Colorless Tourmaline, also known as white or Achroite Tourmaline is the name given to the clear or colorless version of Tourmaline. The word achroite is Greek for colorless. If you are into birthstones then Achroite Tourmaline is one of the ones used for October. If you follow the zodiac then it's used to represent Libra. Tourmaline in general is found on every continent and is possibly the (read full)


Albite: Albite is a member of the feldspar species as is predominantly a white or whitish mineral. A fine Albite gem will be colorless (mostly), or colored similar to moonstone. Some of the better specimens have been found in upper North America including the United States and Canada In 1815 Albite was given the Latin name albus which literally means white. Albite astrological sign is that of A (read full)


Beryllonite: Beryllonite is a clear gem/mineral that gets its name from its high content of beryllium. There are very few gem quality pieces that have been produced. Beryllonite can be found in Pakistan, Brazil, Finland, and Maine. It has a color streak of white, and a vitreous luster. (read full)


Howlite: Howlite an opaque, massive mineral used for ornamental and utilitarian articles. is a rarity for collectors It has a monoclinic tabular crystal system with a subvitreous luster. The most common occurrence is in the form of a cauliflower. Howlite is found in borate deposits, with most ornamental pieces found from various sites in California (USA) and Mexico. It occurs as opaque white, and may be (read full)

Milky Quartz

Milky Quartz: Milky Quartz is a milky white translucent to opaque variety of crystalline quartz of somewhat greasy luster. It is the commonest variety found in pegmatites and hydrothermal veins. The color is generally caused by numerous bubbles of gas and liquid in the crystal. The milky color is caused by small cavities filled with numerous small fluids and CO2 in liquid condition. It is used as a gemstone, a (read full)



Double Refraction or dr is the ability of a mineral to separate a refracted ray of light into 2 rays. If held over an image or text it will display the object 2x its original size.

Mohs Scale of Mineral Hardness is the standard used to categorize a mineral's ability to resist scratching. It gets its name from Friedrich Mohs, the German geologist who first created the scale.

RI or Refractive Index defines light's ability to move through the mineral or in a general sense, any material.

SG or Specific Gravity is the ratio of the weight of any substance to that of pure water at temperature of 3.98°C(39.2°F) and standard atmospheric pressure. This is important to note when actively seeking these minerals in the wild. Minerals with a higher SG will settle below material with a lower sg over time.