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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Location

Info

ne min

ne max

no min

no max

Spectrum

UVS

UVL

Reference

Afghanite

1.52

1.52

 

 

2.52

2.56

 

 

cabochons 2.87 to 7.25 ct, spot RI

 

 

 

 

 

 

 

Gems & Gemology 2003 Winter, p326

Afghanite

1.523

1.529

0.006

0.006

2.49

2.5

 

 

 

 

 

 

 

 

 

orange

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2016 Jun, p52-56

Afghanite

1.53

1.538

0.008

0.008

2.51

2.54

blue

Badakhstan, Afghanistan

 

 

 

 

 

weak absorption band at 590nm

inert to weak red

inert

Gems & Gemology 2008 spring p79

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Afghanite

1.52

1.53

0.005

0.008

2.5

2.65

 

 

 

 

Gemmo.eu 2013

Afghanite

1.522

1.533

0.006

0.006

2.55

2.65

1.528

1.533

1.522

1.528

http://www.geminterest.com 

Afghanite

1.523

1.538

0.006

0.008

2.51

2.65

1.529

1.538

1.523

1.530

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

 

CAUSE OF COLOUR

Stone

colour

cause of colour

reference

Afghanite

blue

SO³-

http://www.dgemg.com/newsletter/gemmologie-aktuell/300-afghanit.html

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

calcite

Afghanite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

diopside

Afghanite

Gems & Gemology 2008 spring p79

lazurite

Afghanite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

psilomelan

Afghanite

Gemmologie, Jun 2016, p 55

pyrite

Afghanite

http://www.geminterest.com

 

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

FeO

CaO

Na2O

K2O

Cl

SrO

BaO

SO3

Afghanite

transparent blue

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Jun 2016, p55

32.33

26.56

0.02

0.01

12.16

13.52

1.21

4.23

0.26

0.16

8.14

Afghanite

translucent blue

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Jun 2016, p55

31.7

26.72

0.02

0.02

11.77

13.3

1.99

4.95

 

 

6.65