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INVESTIGATIONS

 

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

Ulexite

1.491

1.52

0.023

0.039

1.65

2

1.491

1.496

 

 

1.519

1.520

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

Ulexite

1.491

1.52

0.029

0.029

1.96

1.96

1.491

1.491

1.504

1.504

1.520

1.520

Gemmological Tables, Ulrich Henn, 2004 

Ulexite

1.491

1.52

0.026

0.029

2

2

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Ulexite

1.491

1.52

0.023

0.029

1.65

2

1.491

1.496

1.504

1.505

1.519

1.520

http://www.geminterest.com 

Ulexite

1.496

1.519

0.023

0.023

1.65

1.95

1.496

1.496

1.505

1.050

1.519

1.519

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Ulexite

1.496

1.519

0.023

0.023

1.96

1.96

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Ulexite

1.496

1.519

0.023

0.023

1.65

1.95

 

 

 

 

 

 

http://www.gemmology.be 

Ulexite

1.496

1.519

0.023

0.023

1.65

1.95

 

 

 

 

 

 

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

Ulexite

1.51

 

 

 

1.98

1.98

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Ulexite

1.51

1.51

0.02

0.02

1.65

2

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)