Amblygonite

Big Photo

Brazil
4.13 carats
© Rarestone.com

Amblygonite is named after Greek for "crooked angled" referring to mineral's triclinic crystals. The mineral was first discovered in Saxony by August Breithaupt in 1817.

Transparent amblygonite can be faceted and set into jewelry, but it is at risk of breaking and brasion, because its hardness and toughness are poor.

Facet-grade gem rough of yellow amblygonite is found in Brazil and Burma.

Amblygonite Gemstones by Colour

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

Amblygonite Gemstones by Size

This table shows distribution of Amblygonite 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:0.16 cts
Heaviest:7.09 cts
Average:1.79 cts
Total photos:10
Do you have a larger Amblygonite? Why not upload a photo?
0.16ct to 0.85ct0.85ct to 1.55ct1.55ct to 2.24ct2.24ct to 2.93ct2.93ct to 3.63ct3.63ct to 4.32ct4.32ct to 5.01ct5.01ct to 5.70ct5.70ct to 6.40ct6.40ct to 7.09ct
General Information
Chemical Formula
(Li,Na)Al(PO
 
4
)(F,OH)
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Amblygonite Treatments
Colorless material has been reported by Pough(1957) to turn to greenish yellow color on irradiation. Heat could be expected to reverse this change.
Physical Properties of Amblygonite
Mohs Hardness6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.98 to 3.10
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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FractureSub-Conchoidal
Arthur Thomas, Gemstones (2009)
Heat SensitivityModerate heat sensitivity
Arthur Thomas, Gemstones (2009)
Optical Properties of Amblygonite
Refractive Index1.578 to 1.646
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/+,-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.020 to 0.030
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismAbsent
Walter Schumann, Gemstones of the world (2001)
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Dispersion0.014 to 0.015
Walter Schumann, Gemstones of the world (2001)
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Colour
Colour (General)Colourless, yellowish, pink, brown, green, blue
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous,Pearly
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Very weak, green.
Walter Schumann, Gemstones of the world (2001)
Fluorescence (Long-Wave UV)Inert to weak-green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PhosphorescenceMay phosphosesce light blue to LW and SW
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Amblygonite
Crystal SystemTriclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitUsually massive
Arthur Thomas, Gemstones (2009)
Further Information
Mineral information:Amblygonite information at mindat.org
Significant Gem Localities
Brazil
 
  • São Paulo
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
Ted Themelis (2008) Gems & mines of Mogok
        • Mogok Valley
Ted Themelis (2008) Gems & mines of Mogok
        • Pein-Pyit (Painpyit; Pyan Pyit)
Ted Themelis (2008) Gems & mines of Mogok
  • Sagaing Region (Sagaing Division)
    • Katha District
      • Wuntho Township
Ted Themelis (2008) Gems & mines of Mogok
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