Hambergite

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Madagascar
0.21 carats
© Rarestone.com

Hambergite was named in honour of Swedish mineralogist A. Hamberg.

Madagascar is an important source for facet-grade rough of this rare gem. Flawless stones are unusual and the perfect cleavages frequently cause problems for facetier. Rough pieces seldom exceed 4 grams.
15 photos

Hambergite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Hambergite Gemstones by Size

This table shows distribution of Hambergite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.21 cts
Heaviest:2.45 cts
Average:0.74 cts
Total photos:14
Do you have a larger Hambergite? Why not upload a photo?
0.21ct to 0.43ct0.43ct to 0.66ct0.66ct to 0.88ct0.88ct to 1.11ct1.11ct to 1.33ct1.33ct to 1.55ct1.55ct to 1.78ct1.78ct to 2.00ct2.00ct to 2.23ct2.23ct to 2.45ct
General Information
Chemical Formula
Be
 
2
BO
 
3
(OH)
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Physical Properties of Hambergite
Mohs Hardness7.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.33 to 2.37
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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TenacityBrittle
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityPerfect
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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FractureConchoidal
Walter Schumann, Gemstones of the world (2001)
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Optical Properties of Hambergite
Refractive Index1.543 to 1.631
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.071 to 0.074
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) DoublingMore from other references
PleochroismNil
Arthur Thomas, Gemstones (2009)
Dispersion0.015
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, gray-white, yellow-white
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent,Translucent
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Mostly inert, rarely orange
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Hambergite
Crystal SystemOrthorhombic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitPrismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Occurs in granite pegmatites
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Hambergite information at mindat.org
Significant Gem Localities
Madagascar
 
  • Vakinankaratra
    • Betafo District
      • Ambohimanambola
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 415
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