|
Name Origin | After Axel Hamberg, Swedish mineralogist |
---|---|
Chemical Formula | Be2BO3(OH, F) |
Color | COlorless, white, grayish white, yellowish white |
Hardness | 7.5 on Mohs Scale |
Crystal System | Orthorhombic. Crystals prismatic, flattened. |
Cleavage | Perfect 1 direction. Fracture conchoidal to uneven. Brittle |
Specific Gravity (SG) | 2.35 - 2.37 |
Pleochroism | None |
Luster | Vitreous to dull |
Occurrence |
in syenite pegmatites and alkkali pegmatites. |
Stone sizes |
Hambergite is a fairly rare mineral, seldom transparent enough to facet. Cut gems over 5 carats are very rare |
Note: Although hambergite is a hard gemstone, it is mainly a gem for collectors of the unusual. The remarkable properties of this mineral are noteworthy, it has the lowest known density for any gem of such high birefringence (0.072). This combination of properties makes identification fairly easy. Stones have little fire and may resemble quartz. Usually cut stones are not clean, but are filled with cleavage traces.
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Photo Credit:
"Hambergite-49057" by Rob Lavinsky, iRocks.com – CC-BY-SA-3.0. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Hambergite-49057.jpg#/media/File:Hambergite-49057.jpg
References:
1- Color Encyclopedia of Gemstones, Joel E. Arem, VNR publications, New York.
"Hambergite-49057" by Rob Lavinsky, iRocks.com – CC-BY-SA-3.0. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Hambergite-49057.jpg#/media/File:Hambergite-49057.jpg
References:
1- Color Encyclopedia of Gemstones, Joel E. Arem, VNR publications, New York.