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Poudretteite

Big Photo

Myanmar
1.30 carats
© Palagems

Poudretteite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
Chemical Formula
KNa
 
2
B
 
3
Si
 
12
O
 
30
Michael O’Donoghue, Gems, Sixth Edition (2006)
Physical Properties of Poudretteite
Mohs Hardness5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.51 to 2.53
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical Properties of Poudretteite
Refractive Index1.511 to 1.532
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.021
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismStrong: purple-pink/colourless to brownish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Colour
Colour (General)Violet, pink, colourless
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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Crystallography of Poudretteite
Crystal SystemHexagonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitRoughly equant barrel-shaped prismatic crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Poudrettite is found in marble xenoliths
within nepheline syenite breccias in an intrusive alkalic gabbro-syenite complex.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Poudretteite information at mindat.org
Significant Gem Localities
Canada
 
  • QuĂ©bec
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 439
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 439
        • Kyatpyin North
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
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