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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

Celestine

1.620

1.630

0.01

0.01

3.98

3.98

colourless

 

10.64ct

 

 

 

 

 

 

 

inert

weak yellowish

ACAM Lab  321

Celestine

1.621

1.632

0.011

0.011

4.01

4.01

light greyish violet

Madagascar

 

 

 

 

 

 

 

 

very weak green

very weak green

GIA Gem Database  35361

 

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

Celestine

1.617

1.633

0.01

0.014

3.95

4.02

 

 

 

 

 

 

Gemmo.eu 2016

Celestine

1.619

1.635

0.01

0.012

3.96

4

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Celestine

1.619

1.635

0.009

0.012

3.96

4

1.619

1.625

 

 

1.631

1.635

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

Celestine

1.619

1.635

0.01

0.012

3.95

4

1.619

1.625

1.621

1.628

1.630

1.635

Gemmological Tables, Ulrich Henn, 2004 

Celestine

1.619

1.635

0.009

0.012

3.97

4

1.619

1.625

1.624

1.624

1.631

1.635

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Celestine

1.619

1.635

0.01

0.012

3.97

4

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Celestine

1.619

1.635

0.009

0.012

3.97

4

1.619

1.625

1.622

1.624

1.630

1.635

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

Celestine

1.621

1.635

0.008

0.012

3.9

4

1.621

1.625

1.622

1.624

1.630

1.635

http://www.geminterest.com 

Celestine

1.621

1.635

0.009

0.012

3.97

4

 

 

 

 

 

 

http://www.gemmology.be 

Celestine

1.622

1.635

0.009

0.12

3.97

4

 

 

 

 

 

 

Gemology Tools Professional 2010

Celestine

1.623

1.635

0.01

0.01

3.97

4

1.623

1.625

 

 

1.633

1.635

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Celestine

1.625

1.635

0.009

0.01

3.97

3.99

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Celestine

blue

colour centers

American Mineralogist Volume 64, pages 160-168, 1979

Celestine

orange

The color in two specimens of orange celestite was correlated to the presence of copper, probably as Cu+, in the order of 50 ppm

American Mineralogist Volume 64, pages 160-168, 1979

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA