Brazilianite

Brazilianite was named after Brazil, the first country of discovery in 1944. Interesting green and golden hues, vitreous luster, relatively good hardness make brazilianite an attractive gem.

Inclusions are very common and clear faceted gems rarely exceed 15 carats.

Brazilianite Gemstones by Colour

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

Brazilianite Gemstones by Size

This table shows distribution of Brazilianite 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:0.46 cts
Heaviest:9.11 cts
Average:3.00 cts
Total photos:16
Do you have a larger Brazilianite? Why not upload a photo?
0.46ct to 1.33ct1.33ct to 2.19ct2.19ct to 3.06ct3.06ct to 3.92ct3.92ct to 4.79ct4.79ct to 5.65ct5.65ct to 6.52ct6.52ct to 7.38ct7.38ct to 8.25ct8.25ct to 9.11ct
General Information
Chemical Formula
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
4
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Brazilianite Treatments
This material has been reported to fade (Sinkankas, 1972) and to lose its greenish color completely on being heated above 140°C; irradiation did not reverse this change (Requardt et al, 1982) - Nassau (1984)
Physical Properties of Brazilianite
Mohs Hardness5.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.98 to 2.99
Walter Schumann, Gemstones of the world (2001)
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TenacityBrittle
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityGood
Walter Schumann, Gemstones of the world (2001)
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FractureConchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Optical Properties of Brazilianite
Refractive Index1.602 to 1.625
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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Birefringence0.018 to 0.021
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismVery weak
Walter Schumann, Gemstones of the world (2001)
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Dispersion0.014
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Colour
Colour (General)Green, yellowish-green
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
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)None
Walter Schumann, Gemstones of the world (2001)
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Crystallography of Brazilianite
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitCharacteristically equant or spear-head shaped crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:It occurs in phosphate-rich zones of granite pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Brazilianite information at mindat.org
Significant Gem Localities
Brazil
 
  • Minas Gerais
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 392
    • Divino das Laranjeiras
      • Linópolis
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 392
USA
 
  • New Hampshire
    • Grafton Co.
      • Groton
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 392
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