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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

Colemanite

1.581

1.608

0.027

0.027

2.47

2.47

colourless

Kenya

7.78ct

 

 

 

 

 

 

 

very weak greenish yellow

very weak yellow

GIA Gem Database  34351

 

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

Colemanite

1.584

1.615

0.028

0.03

2.4

2.42

1.584

1.586

1.591

1.592

1.614

1.615

Gemmological Tables, Ulrich Henn, 2004 

Colemanite

1.586

1.614

0.028

0.028

2.42

2.42

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Colemanite

1.586

1.615

0.028

0.03

2.4

2.42

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Colemanite

1.586

1.615

0.025

0.03

2.4

2.42

1.586

1.586

 

 

1.613

1.615

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

Colemanite

1.586

1.614

0.028

0.028

2.42

2.42

 

 

 

 

 

 

http://www.gemmology.be 

Colemanite

1.586

1.614

0.028

0.028

2.42

2.42

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Colemanite

1.586

1.614

0.028

0.028

2.4

2.42

1.586

1.586

1.592

1.592

1.614

1.614

http://www.geminterest.com 

Colemanite

1.586

1.614

0.028

0.028

2.42

2.42

1.586

1.586

1.592

1.592

1.614

1.614

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Colemanite

1.586

1.614

0.028

0.028

2.42

2.42

1.586

1.586

1.592

1.592

1.614

1.614

Gems, R Webster, 5th edition 1994 

Colemanite

1.586

1.614

0.028

0.028

2.4

2.42

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

pararealgar

Colemanite

The Jim&Dawn Minette collection, 2010

 

LOCALITIES

 

CHEMICAL DATA