Ceylonite

Ceylonite was named after the island of Ceylon. It is a ferroan Spinel with a ratio Mg:Fe from 3:1 and 1:1, and little or no ferric iron.
General Information
A variety or type of:Spinel
Chemical Formula
(Mg,Fe
2+
 
)Al
 
2
O
 
4
Gemdat.org, Management Team (2012)
More from other references
Physical Properties of Ceylonite
Mohs Hardness7.5 to 8
Michael O’Donoghue, Gems, Sixth Edition (2006)
Specific Gravity3.63 to 3.9
Roger Dedeyn, Tables of Gemstone Identification (2007)
Cleavage QualityNone
Michael O’Donoghue, Gems, Sixth Edition (2006)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Ceylonite
Refractive Index1.770 to 1.780
Roger Dedeyn, Tables of Gemstone Identification (2007)
Optical CharacterIsotropic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
TransparencyTransparent,Translucent,Opaque
Michael O’Donoghue, Gems, Sixth Edition (2006)
LustreVitreous
Arthur Thomas, Gemstones (2009)
Crystallography of Ceylonite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Further Information
Mineral information:Ceylonite information at mindat.org
Significant Gem Localities
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
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