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

Andalusite

1.63

1.641

0.011

0.011

3.21

3.21

greenish brown

Sri Lanka

1.97ct

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p169

Andalusite

1.63

1.64

0.01

0.01

3.16

3.16

greenish yellow

Brazil

13.22 ct, biaxial -

442, 457nm

inert

inert

GIA Gem Database  33922

Andalusite

1.63

1.643

0.013

0.013

3.17

3.17

green-brown

0.95 ct

1.634

1.634

1.643

1.643

inert

inert

ACAM Lab  N°1313

Andalusite

1.63

1.63

0.013

0.013

3.19

3.19

brownish green-red

0.46 ct

1.630

1.630

1.639

1.639

1.643

1.643

inert

inert

ACAM Lab  N°4414

Andalusite

1.63

1.64

0.01

0.01

3.16

3.16

greenish brown

0.38ct

1.630

1.630

1.639

1.639

1.640

1.640

yellowish green

inert

ACAM Lab  N°4460

Andalusite

1.63

1.658

0.028

0.28

3.18

3.18

brown

1 ct

1.630

1.630

1.646

1.646

1.658

1.658

inert

olive green

ACAM Lab  N°1022

Andalusite

1.63

1.644

0.014

0.014

3.23

3.23

greenish pink

0.42 ct

1.630

1.630

1.637

1.637

1.644

1.644

inert

yellow-reen

ACAM Lab  N°188

Andalusite

1.63

1.641

0.011

0.011

3.16

3.16

brown-green

0.38ct

1.630

1.630

1.638

1.638

1.641

1.641

inert

inert

ACAM Lab  N°4459

Andalusite

1.63

1.63

3.13

3.13

mottled purplish pinkish brown bodycolor with black "spokes"

sphere 26.33mm, opaque "chiastolite"

Gems & Gemology 1998 Spring, p51

Andalusite

1.63

1.64

0.01

0.01

3.16

3.16

medium greenish yellow

Brazil

13.22ct

line at 442nm and 457nm

inert

inert

GIA Gem Database  33922

Andalusite

1.63

1.639

0.009

0.009

3.16

3.16

dark greenish yellow

Brazil

16.13ct

no features

inert

inert

GIA Gem Database  33917

Andalusite

1.631

1.64

0.009

0.009

3.16

3.16

greenish yellow

Espirito Santo, Brazil

16.71ct

inert

inert

GIA Gem Database  34263

Andalusite

1.632

1.646

0.01

0.011

3.15

3.15

green+colourless and green/pink

Santa Tereza, Espirito Santo, Brazil

20.71 ct

1.632

1.635

1.637

1.640

1.642

1.646

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1996 Dec, p153

Andalusite

1.633

1.64

0.007

0.007

3.16

3.16

greenish yellow

Espirito Santo, Brazil

14.41ct

442, 458nm

weak green

inert

GIA Gem Database  33924

Andalusite

1.633

1.647

0.014

0.014

3.17

3.17

olive green

Brazil

The Journal of Gemmology 1983 Vol18, N°7, p581-591

Andalusite

1.633

1.642

0.009

0.009

3.16

3.16

dark greenish yellow

Brazil

10.62ct

line at 460nm

weak green

inert

GIA Gem Database  33918

Andalusite

1.634

1.645

0.011

0.011

3.15

3.17

olive-green to yellow-green

Maricota, Minas Gerais, Brazil

weak band 455nm

pale mustard

Revue de  Gemmologie A.F.G. 1989 Sep, N° 100, p7-9

Andalusite

1.634

1.643

0.009

0.009

3.33

3.33

brownish

0.4 ct

1.634

1.634

1.638

1.638

1.643

1.643

cut-off 440nm

inert

inert

ACAM Lab  N°1312

Andalusite

1.635

1.635

0.02

0.02

3.28

3.28

light brown

0.59 ct

1.635

1.635

1.642

1.642

1.655

1.655

yellow

inert

ACAM Lab  N°105

Andalusite

1.635

1.642

0.007

0.007

3.15

3.15

reddish orange

Sri Lanka

2.25ct

line at 460nm

inert

inert

GIA Gem Database  34773

Andalusite

1.637

1.654

0.008

0.01

3.11

3.16

green, yellowish green to brownish green, brownish pink, bicoloured green/pink, pinkish brown

Brazil

transparent to opaque

1.637

1.649

1.646

1.654

diffuse band at 455

inert

moderate to strong yellowish green

Gems & Gemology 2009 Summer, p120-129

Andalusite

1.637

1.649

0.012

0.012

3.22

3.22

greenish yellow

Sri Lanka

9.04ct

line at 443nm and 460nm

weak green

inert

GIA Gem Database  33919

Andalusite

1.638

1.652

0.014

0.014

3.12

3.12

greenish

0.19 ct

555nm, 520nm line

inert

inert

ACAM Lab  N°4741

Andalusite

1.638

1.649

0.011

0.011

yellow green to peridot green

Chapada Diamantina, Bahia, Brazil

inert

inert

Revue de  Gemmologie A.F.G. 1980 N°63, p15-17

Andalusite

1.64

1.648

0.008

0.008

3.28

3.28

dark green

Brazil

0.19ct

555nm, 520nm line

inert

inert

ACAM Lab  N°4742

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

Andalusite

1.627

1.651

0.007

0.013

3.05

3.2

1.627

1.642

1.640

1.651

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Andalusite

1.627

1.65

0.007

0.013

3.05

3.2

1.627

1.642

1.638

1.650

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

Andalusite

1.627

1.649

0.007

0.011

3.05

3.2

http://www.gemmology.be 

Andalusite

1.628

1.65

0.007

0.013

3.05

3.2

1.628

1.640

1.633

1.644

1.638

1.650

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

Andalusite

1.629

1.66

0.007

0.013

3.05

3.2

1.629

1.649

1.633

1.653

1.638

1.660

Gemmological Tables, Ulrich Henn, 2004 

Andalusite

1.629

1.652

0.007

0.016

3.12

3.18

1.629

1.640

1.633

1.646

1.638

1.652

http://www.geminterest.com 

Andalusite

1.629

1.65

0.007

0.011

3.13

3.17

1.629

1.640

1.633

1.644

1.638

1.650

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Andalusite

1.629

1.648

0.007

0.013

3.13

3.21

Gemology Tools Professional 2010

Andalusite

1.629

1.651

0.009

0.014

3.1

3.2

Gemmo.eu 2013

Andalusite

1.633

1.648

0.007

0.012

3.12

3.21

1.633

1.642

1.643

1.648

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Andalusite

1.634

1.648

0.009

0.01

3.1

3.2

John Sinkakas, Gemstone and mineral data book,1972 

Andalusite

1.634

1.648

0.007

0.011

3.15

3.17

1.634

1.641

1.644

1.648

Gems, R Webster, 5th edition 1994 

Andalusite viridine

1.66

1.69

0.029

0.029

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Andalusite viridine

1.66

1.689

0.029

0.029

3.05

3.2

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

Stone

Colour

Cause of colour

Reference

Andalusite viridine

dark green

Mn³+ in octahedral coordination

Gems & Gemology Summer 1988

Andalusite

green, brown

charge transfer Fe²+-O-Ti4+

Gems & Gemology Summer 1988

Andalusite

yellowish green

Fe³+

http://minerals.caltech.edu

Inclusion

Stone

Reference

apatite

Andalusite

Gems & Gemology 1980 Winter p401-404

biotite

Andalusite

Gems & Gemology 1980 Winter p401-404

ferrocolumbite

Andalusite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 3

graphite

Andalusite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 3

hematite

Andalusite

Revue de  Gemmologie A.F.G., 1989, Sep, N°100, p7-9

limonite

Andalusite

Gems & Gemology 1980 Winter p401-404

limonite

Andalusite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 3

quartz

Andalusite

Gems & Gemology 1980 Winter p401-404

rutile

Andalusite

Internal World of Gemstones, Gübelin, 1983

sillimanite

Andalusite

Revue de  Gemmologie A.F.G., 1989, Sep, N°100, p7-9

zircon

Andalusite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 3

STONE

LOCALITIES

REFERENCE

Andalusite

Merelani Hills (Mererani), Umba Valley

Lelatema Mts

Arusha Region

Tanzania

Gemmologie, 1997, Mar, p31

Andalusite

Santa Teresa

Espirito Santo

Brazil

Gemmologie 1996, Dec, p153