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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

Stibiotantalite

 

 

 

 

7.33

7.33

near colourless

 

0.88ct

 

 

 

 

 

 

 

 

 

Gems & Gemology 1980 Spring, p268

 

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

Stibiotantalite

2.37

2.45

0.08

0.08

7.2

7.8

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Stibiotantalite

2.37

2.45

0.07

0.08

7.2

7.8

2.370

2.370

 

 

2.450

2.450

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

Stibiotantalite

2.37

2.45

0.08

0.08

7.2

7.9

2.370

2.370

2.400

2.400

2.450

2.450

Gemmological Tables, Ulrich Henn, 2004 

Stibiotantalite

2.37

2.46

0.09

0.09

7.34

7.46

 

 

 

 

 

 

http://www.gemmology.be 

Stibiotantalite

2.37

2.46

0.09

0.09

7.34

7.46

2.370

2.370

2.400

2.400

2.460

2.460

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Stibiotantalite

2.37

2.46

0.09

0.09

7.34

7.46

2.370

2.370

2.400

2.400

2.460

2.460

http://www.geminterest.com 

Stibiotantalite

2.37

2.46

0.09

0.09

7.34

7.46

 

 

 

 

 

 

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

Stibiotantalite

2.37

2.46

0.09

0.09

7.34

7.46

 

 

 

 

 

 

Gemology Tools Professional 2010

Stibiotantalite

2.37

2.458

0.087

0.093

5.95

7.55

 

 

 

 

 

 

Gemmo.eu 2013

Stibiotantalite

2.39

2.46

0.07

0.07

7.35

7.46

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Stibiotantalite

2.39

2.46

0.07

0.07

7

7.45

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Stibiotantalite

2.39

2.46

0.07

0.07

7.46

7.46

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)