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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Locality

Info

nx min

nx max

ny min

ny max

nz min

nz max

Spectrum

UVS

UVL

Reference

Sanidine

1.516

1.526

0.005

0.007

2.57

2.58

colourless to smoky brown

Volkesfeld, Mendig, Eifel, Germany

86% K-feldspar and 14% albite

1.516

1.520

 

 

1.522

1.526

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Jun, p92-93

Sanidine

1.52

1.524

0.004

0.004

2.58

2.58

dark brownish yellowish orange

Volkesfeld, Eifel, Germany

28.96ct, biaxial-

 

 

 

 

 

 

 

inert

inert

GIA Gem Database  33094

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

nx min

 nx max

ny min

ny max

nz min

nz max

Reference

Sanidine

1.516

1.53

0.006

0.008

2.55

2.62

1.516

1.520

 

 

1.521

1.530

Gemme, Dati per l'identificazione, P. De Stefano et al, 1993 

Sanidine

1.516

1.534

0.003

0.007

2.56

2.62

1.516

1.527

1.520

1.533

1.521

1.534

http://www.geminterest.com 

Sanidine

1.516

1.534

0.004

0.008

2.56

2.62

1.516

1.527

 

 

1.522

1.534

Tables of Gemstone Identification, Roger Dedeyn, Ivo Quintens, 2007 

Sanidine

1.518

1.534

 

 

2.56

2.62

1.518

1.527

1.522

1.533

1.522

1.534

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Sanidine

1.518

1.534

0.004

0.007

2.56

2.62

 

 

 

 

 

 

http://www.gemmology.be 

Sanidine

1.518

1.524

0.006

0.006

2.57

2.58

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Sanidine

 

 

 

 

2.56

2.57

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Sanidien

Volkesfeld, Weibern

Eifel

Rhineland-Palatinate

Germany

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Jun, p92-93

 

CHEMICAL DATA (%)