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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

Danburite

1.628

1.638

0.01

0.01

3.01

3.01

colourless

 

2.06ct

1.628

1.628

1.632

1.632

1.638

1.638

 

light blue

inert

ACAM lab  1065

Danburite

1.629

1.638

0.007

0.009

2.97

3.01

yellow

Tanzania

 

1.629

1.631

 

 

1.638

1.638

none

inert

inert

Gems & Gemology 2008 summer p169-171

Danburite

1.629

1.636

0.007

0.007

2.99

2.99

yellow

Morogoro, Tanzania

8.86ct

1.629

1.629

1.632

1.632

1.636

1.636

line at 585nm

 

 

http://www.geminterest.com 2008

Danburite

1.63

1.636

0.009

0.009

3

3

green

Momeik (Molo) , Mogok, Myanmar

 

 

 

 

 

 

 

 

weak

weak

The Australian Gemmologist 2005 22, p303-309

Danburite

1.63

1.638

0.008

0.008

3

3

golden yellow

Sri Lanka

 

 

 

 

 

 

 

line at 585nm

inert

inert

Gems & Gemology 1986 spring p47

Danburite

1.63

1.636

0.006

0.006

2.99

2.99

colourless

Dalnegorsk, Russia

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p171

Danburite

1.63

1.636

0.006

0.006

3

3

dark yellowish orange

Russia

6.51ct, biaxial +

 

 

 

 

 

 

broad absorption below 530nm

inert

inert

GIA Gem Database  35375

Danburite

1.63

1.636

0.006

0.006

3.01

3.01

orangy yellow

Anjanabonoina Mine, Ambohimanambola, Antananarivo Province, Madagascar

15.81ct

 

 

 

 

 

 

 

inert

weak green

GIA Gem Database  34391

Danburite

1.63

1.634

0.004

0.004

 

 

yellow

Mogok, Myanmar

 

 

 

 

 

 

 

 

blue

blue

Gems & Gemology 2007 Summer, p167-168

Danburite

1.63

1.637

0.006

0.008

2.98

3.01

honey yellow

Luc Yen mining area, Vietnam

4.6ct

1.630

1.632

1.633

1.635

1.636

1.637

 

inert

strong blue

Gems & Gemology 2016 Winter, p393-401

Danburite

1.631

1.639

0.008

0.008

2.95

2.95

colourless

Sri Lanka

1.58ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Jul p106

 

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

Danburite

1.624

1.641

0.004

0.01

2.93

3.06

 

 

 

 

 

 

Gemmo.eu 

Danburite

1.627

1.641

0.006

0.008

2.9

3.01

1.627

1.633

1.630

1.637

1.633

1.641

Gemmological Tables, Ulrich Henn, 2004 

Danburite

1.627

1.639

0.006

0.006

2.99

3.01

1.627

1.633

 

 

1.633

1.639

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Danburite

1.627

1.633

0.006

0.006

2.97

3.03

 

 

 

 

 

 

Gemology Tools Professional 2010

Danburite

1.628

1.641

0.004

0.008

2.97

3.03

1.628

1.633

1.630

1.637

1.633

1.641

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

Danburite

1.63

1.641

0.006

0.008

2.97

3.03

1.630

1.633

 

 

1.633

1.641

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

Danburite

1.63

1.641

0.006

0.008

2.97

3.03

 

 

 

 

 

 

http://www.gemmology.be 

Danburite

1.63

1.641

0.006

0.008

2.9

3.1

1.630

1.633

1.633

1.637

1.636

1.641

http://www.geminterest.com 

Danburite

1.63

1.641

0.006

0.008

2.97

3.03

1.630

1.633

1.633

1.637

1.636

1.641

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Danburite

1.63

1.636

0.006

0.006

3

3

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Danburite

1.63

1.64

0.006

0.008

2.99

3.01

1.630

1.633

 

 

1.633

1.640

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Danburite

 

 

0.006

0.006

2.99

3

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Danburite

greenish-yellow

in part from rare-earths

http://minerals.caltech.edu

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Danburite

Obira mine

Ono-gun

Oita Prefecture

Japan

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp

Danburite

 

 

 

Madagascar

Joel Arem, Color Encyclopedia of Gemstones, 1987

Danburite

 

Vakinankaratra Region (Betafo - Antsirabé region)

Antananarivo Province

Madagascar

Gemmologie, Dez 1999,p196

Danburite

San Sebastian Mine

Charcas

San Luis Potosi

Mexico

Lapis 1993/3

Danburite

Momeik

Mogok

Mandalay

Myanmar

The Australian Gemmologist (2005) 22, p308

Danburite

Hyakule

Sankhuwasabha District (Sankhuwa Sahba)

Kosi Zone

Nepal

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1993, Sep, p78

Danburite

 

Luc Yen

Yenbai (Yen Bai) Province

Vietnam

Gems & Gemology Winter 2016, p393-401

 

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

CaO

B2O3

Danburite

yellow

Luc Yen

Vietnam

Gems & Gemology 2016 Winter, p396

46.6

22.7

31.4

Danburite

yellow

Luc Yen

Vietnam

Gems & Gemology 2016 Winter, p396

47.3

22.7

31.5