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Eudialyte

General Information
Chemical Formula
Na
 
4
(Ca,Ce)
 
2
(Fe,Mn,Y)ZrSi
 
8
O
 
22
(OH,Cl)
 
2
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Physical Properties of Eudialyte
Mohs Hardness5 to 5.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.74 to 3.00
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityPoor
Arthur Thomas, Gemstones (2009)
FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Eudialyte
Refractive Index1.591 to 1.633
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterUniaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.003 to 0.010
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismWeak
Arthur Thomas, Gemstones (2009)
DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Red
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTranslucent,Opaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Crystallography of Eudialyte
Crystal SystemHexagonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitShort rhombohedral to prismatic crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Occurs in nepheline syenites, alkalic granites and associated pegmatites
Michael O’Donoghue, Gems, Sixth Edition (2006)
Spectrographic Data
Calculated Spectra:
Click spectra for more information
Eudialyte - Locality: Unknown
Further Information
Mineral information:Eudialyte information at mindat.org
Significant Gem Localities
Canada
 
  • QuĂ©bec
    • Abitibi-TĂ©miscamingue
      • TĂ©miscamingue RCM
        • Les Lacs-du-TĂ©miscamingue
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 410
    • MontĂ©rĂ©gie
      • La VallĂ©e-du-Richelieu RCM
        • Mont Saint-Hilaire
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 410
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