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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

Amblygonite

1.61

1.636

0.026

0.026

3.033

3.033

golden yellow

 

 

1.610

1.610

1.621

1.621

1.636

1.636

 

 

 

Gems & Gemology 1955 Fall, p208-214

Amblygonite

1.61

1.635

0.025

0.025

3.08

3.08

yellowish

 

0.83 ct

1.610

1.610

1.623

1.623

1.635

1.635

 

inert

light green

ACAM Lab  N° 562

Amblygonite

1.611

1.638

0.026

0.026

3.011

3.017

colourless

 

 

1.611

1.612

1.618

1.621

1.637

1.638

 

 

 

Gems & Gemology 1955 Fall, p208-214

Amblygonite

1.612

1.638

0.025

0.026

3.017

3.033

pale yellow

 

 

1.612

1.612

1.621

1.621

1.638

1.638

 

 

 

Gems & Gemology 1955 Fall, p208-214

Amblygonite

1.619

1.633

0.014

0.014

3.03

3.03

brownish yellow

 

12.18ct, biaxial -

 

 

 

 

 

 

 

inert

inert

GIA Gem Database  33905

 

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

Amblygonite

1.576

1.613

0.02

0.03

3.04

3.11

1.576

1.591

1.592

1.605

1.596

1.613

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

Amblygonite

1.577

1.613

0.019

0.022

2.96

3.11

 

 

 

 

 

 

Gemmo.eu 2015

Amblygonite

1.578

1.633

0.2

0.22

2.98

3.11

1.578

1.611

 

 

1.598

1.633

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Amblygonite

1.578

1.612

0.02

0.022

2.98

3.11

1.578

1.597

1.595

1.605

1.598

1.612

http://www.geminterest.com 

Amblygonite

1.578

1.636

0.02

0.027

2.98

3.11

 

 

 

 

 

 

Gemology Tools Professionel 2010

Amblygonite

1.602

1.646

0.02

0.03

3

3.1

1.602

1.622

 

 

1.626

1.646

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

Amblygonite

1.602

1.646

0.024

0.03

3

3.1

1.602

1.622

1.610

1.631

1.636

1.646

Gemmological Tables, Ulrich Henn, 2004 

Amblygonite

1.611

1.636

0.023

0.027

2.95

3.08

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Amblygonite

1.611

1.637

0.026

0.026

3.01

3.03

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Amblygonite

1.612

1.638

0.026

0.026

3.02

3.04

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Amblygonite

1.612

1.646

0.024

0.03

3

3.1

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Amblygonite

 

Karibib District

Erongo Region

Namibia

Joel Arem, Color Encyclopedia of Gemstones, 1987