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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

Andesine

1.55

1.561

0.009

0.009

2.69

2.72

brownish red to orange red (Tibet) , yellow (Inner Mongolia)

Tibet and  Inner Mongolia

alluvial deposit, chelsea for red stones : red

 

 

 

 

 

 

 

red: dark red; yellow : inert

red: orange; yellow: inert

Gems & Gemology 2008 Winter, p369-373

Andesine

1.55

1.561

0.009

0.01

2.67

2.72

brownish-red, reddsh-orange, orange-red an deep red, bicoloured:  red-green and red-colourless

Bainang, Xigazê area, Tibet

biaxe positive, chelsea: red, up to 5ct

1.550

1.551

1.555

1.556

1.560

1.561

broad absorption at 560, very weak band at 630nm

dark red or inert

weak chalky orange

The Journal of Gemmology 2009 Vol31, N°5-8, p283-298

Andesine

1.551

1.56

0.009

0.009

2.67

2.67

red

Congo (?)

 

 

 

 

 

 

 

moderately broad band with maximum at 565nm

weak red

weak to medium orange

Gems & Gemology 2002 spring p 94

Andesine

1.552

1.561

0.009

0.009

2.69

2.69

bluish (moonstone)

India

1.63ct, 50.7% albite, 46.3% anorthite and 3% orthoclase

1.552

1.552

1.557

1.557

1.561

1.561

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1989 Apr, p43-44

Andesine

1.552

1.56

0.008

0.008

2.69

2.72

yellow

 Springsure, Queensland, Australia

 

 

 

 

 

 

 

 

inert

inert

The Australian Gemmologist 2014 Vol25, No 6-7, p231-238

Andesine

1.554

1.562

0.008

0.008

2.69

2.69

red

Congo (?)

 

1.554

1.554

1.557

1.557

1.562

1.562

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2005 Mar, p53-55

Andesine

1.554

1.562

0.008

0.008

2.69

2.69

red

Congo (?)

 

1.554

1.554

1.557

1.557

1.562

1.562

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2005 Mar, p53-55

 

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

Andesine

1.542

1.562

0.006

0.01

2.65

2.69

 

 

 

 

 

 

Gemmo.eu 2015

Andesine

1.543

1.551

0.008

0.008

2.65

2.69

1.543

1.543

1.548

1.548

1.551

1.551

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Andesine

1.543

1.551

0.008

0.008

2.65

2.69

1.543

1.543

 

 

1.551

1.551

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

Andesine

1.543

1.551

0.008

0.008

2.65

2.69

 

 

 

 

 

 

http://www.gemmology.be 

Andesine

1.543

1.564

0.007

0.011

2.65

2.69

1.543

1.555

1.548

1.559

1.551

1.564

http://www.geminterest.com 

Andesine

1.543

1.563

0.008

0.008

2.65

2.69

1.543

1.556

1.548

1.548

1.551

1.563

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

Andesine (red)

1.551

1.562

0.008

0.009

2.67

2.69

1.551

1.554

 

 

1.560

1.562

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Andesine (red)

1.551

1.562

0.008

0.009

2.67

2.69

1.551

1.554

 

 

1.560

1.562

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

Andesine

1.552

1.562

0.08

0.009

2.68

2.69

1.552

1.554

1.557

1.557

1.561

1.562

Gemmological Tables, Ulrich Henn, 2004 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Andesine

green

may result from Cu0-Cu+ intervalence charge or from differences in shape and size of the copper particles

The Journal of Gemmology, 2009, Vol31, N°5-8, p298

Andesine

red

clusters of tiny copper particles

The Journal of Gemmology, 2009, Vol31, N°5-8, p298

Andesine

red

Fe³+ in tetrahedric coordination

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1992, Apr p51

Andesine

yellow

Fe³+

The Australian Gemmologist 2014, Vol25, No 6-7, p237

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

copper

Andesine

The Journal of Gemmology 2009 , Vol 31, N°5-8, p283-298

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

andesine

Bainang

Xigazê (Rikaze; Shigatse) Prefecture

Tibet Autonomous Region

China

The Journal of Gemmology 2009, Vol 31, N°5-8, p283-298

andesine

 

 

 

India

Gemmologie 4 Dec 2001 p185

andesine

 

 

 

Madagascar

Gemmologie 4 Dec 2001 p185

 

CHEMIE (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

FeO

CaO

Na2O

K2O

TiO2

Fe2O3

SrO

Andesine

bluish (moonstone)

 

India

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1991, Apr, p44

55.05

28.17

0.08

10.19

5.24

0.5

 

 

 

Andesine

yellow

Springsure, Queensland

Australia

The Australian Gemmologist 2014, Vol 25, No 6-7, p234

53.66

28.22

 

9.9

5.83

0.77

0.31

1.12

0.16

Andesine

yellow

Hogarth Range, New South Wales

Australia

The Australian Gemmologist 2014, Vol 25, No 6-7, p234

53.29

29.18

 

10.11

6.14

0.58

0.11

0.42

0.14

Andesine

yellow

Hogarth Range, New South Wales

Australia

The Australian Gemmologist 2014, Vol 25, No 6-7, p234

55.08

27.8

 

10.18

5.93

0.49

0.09

0.32

0.16

Andesine

yellow

Hogarth Range, New South Wales

Australia

The Australian Gemmologist 2014, Vol 25, No 6-7, p234

55.28

27.6

 

9.62

6.43

0.57

0.12

0.31

0.16