Carletonite

Big Photo

Canada
2.05 carats
© raregemhunter

Carletonite is named after Carleton University, Ottawa, Canada, where it was first recognized.

Carletonite has been found as transparent pale blue, opaque to translucent pink, white and grey material with colour zoning.

Carletonite 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
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F) · H
 
2
O
Michael O’Donoghue, Gems, Sixth Edition (2006)
Physical Properties of Carletonite
Mohs Hardness4 to 4.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.45
Walter Schumann, Gemstones of the world (2001)
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Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
Optical Properties of Carletonite
Refractive Index1.517 to 1.521
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.004
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismSome of the blue specimens may show blue to pinkish brown pleochroism
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Deep blue, pale blue
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Walter Schumann, Gemstones of the world (2001)
Crystallography of Carletonite
Crystal SystemTetragonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Geological Environment
Where found:Is found in nepheline syenite
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Carletonite information at mindat.org
Significant Gem Localities
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 395
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