Rinkite-(Ce)

Rinkite is named after Henrik Rink, Director of the Royal Greenland Board of Trade.

Rinkite forms translucent to opaque reddish brown, yellow-brown prismatic and flattened crystals or masses.

Rinkite gemstones have been fashioned.

General Information
Chemical Formula
(Ca,Ce)
 
4
Na(Na,Ca)
 
2
Ti(Si
 
2
O
 
7
)
 
2
F
 
2
(O,F)
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Rinkite-(Ce)
Mohs Hardness5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.29 to 3.33
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityDistinct
Anthony et al, Handbook of mineralogy (2001)
FractureUneven,Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Rinkite-(Ce)
Refractive Index1.653 to 1.662
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.009
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismSlight, in yellow tints.
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Yellow-brown
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTranslucent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous,Resinous,Greasy
Anthony et al, Handbook of mineralogy (2001) Vitreous on fractures, resinous to greasy on cleavages
Crystallography of Rinkite-(Ce)
Crystal SystemMonoclinic
Michael O’Donoghue, Gems, Sixth Edition (2006)
HabitMassive
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Rinkite occurs in nepheline syenites and related pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Rinkite-(Ce) information at mindat.org
Significant Gem Localities
Russia
 
  • Murmansk Oblast
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