Starlite

Trade term for blue zircon variety, created through heating other zircons.
General Information
A variety or type of:Zircon
Chemical Formula
ZrSiO
 
4
Michael O’Donoghue, Gems, Sixth Edition (2006)
Physical Properties of Starlite
Mohs Hardness6.5 to 7.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Specific Gravity3.91 to 4.73
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
TenacityBrittle
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Starlite
Refractive Index1.790 to 2.015
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.005 to 0.055
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Colour
Colour (General)Blue
Gemdat.org, Management Team (2012)
Causes of ColourBlue, U4+.
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent,Translucent
Arthur Thomas, Gemstones (2009)
LustreAdamantine
Arthur Thomas, Gemstones (2009)
Crystallography of Starlite
Crystal SystemTetragonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
HabitPrismaic
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Starlite information at mindat.org
Significant Gem Localities
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
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