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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

Witherite

1.532

1.679

0.147

0.147

4.27

4.27

colourless

 

0.40ct

1.532

1.532

1.676

1.676

1.679

1.679

 

strong white

bluish

ACAM lab  4743

 

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

Witherite

1.52

1.52

 

 

4.27

4.45

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Witherite

1.526

1.68

0.145

0.151

4.21

4.35

 

 

 

 

 

 

Gemmo.eu 

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

 

 

1.529

1.529

1.676

1.676

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Witherite

1.529

1.677

0.148

0.148

4.3

4.3

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

1.529

1.532

 

 

1.674

1.677

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

Witherite

1.529

1.68

0.148

0.148

4.27

4.35

1.529

1.532

1.676

1.678

1.677

1.680

Gemmological Tables, Ulrich Henn, 2004 

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

 

 

 

 

 

 

http://www.gemmology.be  

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

1.529

1.529

1.676

1.676

1.677

1.677

http://www.geminterest.com 

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

 

 

 

 

 

 

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

Witherite

1.529

1.677

0.148

0.148

4.27

4.79

 

 

 

 

 

 

Gemology Tools Professional 2010

Witherite

1.532

1.68

0.148

0.148

4.27

4.35

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Witherite

1.532

1.68

0.148

0.148

4.27

4.35

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)