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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

Petalite

1.504

1.517

0.013

0.013

2.394

2.394

colourless

Brazil

2 stones of 26ct

1.50

1.50

1.51

1.51

1.52

1.52

 

 

 

The Journal of Gemmology 1972 N°3,p95

Petalite

1.505

1.516

0.011

0.011

2.39

2.39

 

 

 

 

 

 

 

 

 

no 454nm

 

weak orange

Australian Gemmologist 2003 10, p409

Petalite

1.505

1.515

0.01

0.01

2.4

2.4

colourless

Laghman, Afghanistan

 

 

 

 

 

 

 

no lines or bands

inert

inert

Gems & Gemology 2009 Summer, p150-151

Petalite

1.505

1.519

0.014

0.014

2.41

2.41

colourless

Itinga, Minas Gerais, Brazil

5.2ct

1.505

1.505

1.511

1.511

1.519

1.519

 

inert

inert

ACAM Lab  4497

Petalite

1.505

1.515

0.01

0.01

2.42

2.42

colourless

 

0.79ct

1.505

1.505

1.508

1.508

1.515

1.515

 

inert

inert

ACAM Lab  1151

Petalite

1.506

1.52

0.012

0.014

2.403

2.419

white, colourless, pinkish brown

Momeik (Molo) , Mogok, Birma

 

1.506

1.508

1.510

1.515

1.520

1.520

 

inert and weak yellow

inert and weak yellow

The Australian Gemmologist 2005 22, p303-309

Petalite

1.507

1.52

0.013

0.013

2.41

2.41

colourless

Itinga, Minas Gerais, Brazil

16.48ct

 

 

 

 

 

 

 

inert

inert

GIA Gem Database  35291

Petalite

1.509

1.52

0.011

0.011

2.41

2.41

colourless

Minas Gerais, Brazil

11.14ct

 

 

 

 

 

 

 

inert

inert

GIA Gem Database  35474

Petalite

 

 

 

 

2.39

2.39

orangy red

 

17.60ct, opaque, cabochon, cat's eye

 

 

 

 

 

 

broad absorption below 420nm

inert

weak yellow

GIA Gem Database  35461

 

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

Petalite

1.5

1.524

0.01

0.015

2.3

2.5

 

 

 

 

 

 

Gemmo.eu 

Petalite

1.501

1.519

0.012

0.014

2.39

2.46

1.501

1.507

 

 

1.513

1.519

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Petalite

1.502

1.519

0.012

0.017

2.38

2.4

1.502

1.505

1.509

1.509

1.515

1.519

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Petalite

1.502

1.523

0.012

0.017

2.34

2.49

1.502

1.510

 

 

1.515

1.523

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

Petalite

1.502

1.518

0.012

0.016

2.39

2.4

1.502

1.505

1.509

1.512

1.515

1.518

Gemmological Tables, Ulrich Henn, 2004 

Petalite

1.502

1.523

0.012

0.016

2.3

2.6

1.502

1.510

1.508

1.521

1.516

1.523

http://www.geminterest.com 

Petalite

1.502

1.522

0.012

0.016

2.39

2.46

 

 

 

 

 

 

Gemology Tools Professional 2010

Petalite

1.503

1.523

0.012

0.014

2.3

2.5

 

 

 

 

 

 

http://www.gemmology.be 

Petalite

1.503

1.523

0.012

0.014

2.3

2.5

1.503

1.510

1.510

1.521

1.516

1.523

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Petalite

1.503

1.523

0.012

0.014

2.3

2.5

1.503

1.510

1.510

1.521

1.516

1.523

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

Petalite

1.504

1.516

0.012

0.012

2.39

2.46

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Petalite

1.504

1.52

0.012

0.014

2.39

2.46

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Petalite

Momeik

Mogok

Mandalay

Myanmar

The Australian Gemmologist (2005) 22, p308







 

CHEMICAL DATA (%)