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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

Kornerupine

1.639

1.651

0.012

0.012

3.3

3.3

orangy yellow

Okkampitiya, Uva Province, Sri Lanka

3.96ct, biaxial -

 

 

 

 

 

 

 

weak orangy yellow

inert

GIA Gem Database  34067

Kornerupine

1.66

1.678

0.016

0.017

3.28

3.32

intens green

Usambara Mts, near Tanga, Tanzania

 

1.660

1.662

1.673

1.674

1.675

1.678

 

faint yellow

strong chalky yellow

Gems & Gemology 2009 spring p 66

Kornerupine

1.66

1.685

0.013

0.013

3.293

3.351

light brownish yellow to greyish green

Embilipitiya, Sri Lanka

 

 

 

 

 

 

 

 

 

 

The Australian Gemmologist 1986 Vol 16, Nr 2, p35-40

Kornerupine

1.66

1.672

0.01

0.012

3.27

3.27

groen

Tanzania

1.19 and 0.55 ct, transparent

1.660

1.660

 

 

1.670

1.672

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2009 58/3-4/Dec, p78

Kornerupine

1.66

1.677

0.013

0.015

3.28

3.29

olive green, green

Begogo, Madagascar

is in fact prismatine (content of B is 0.71 apfu); optical sign (+) and (-)

1.660

1.664

1.670

1.671

1.675

1.677

 

inert to weak yellow

inert

The Australian Gemmologist 2010 Vol24, N2, p38-40

Kornerupine

1.66

1.67

0.01

0.01

3.27

3.27

yellowish green

Kwale District, Coast Province, Kenya

1.64ct, biaxial -

 

 

 

 

 

 

broad absorption below 420

yellowish green

weak yellowish green

GIA Gem Database  34365

Kornerupine

1.66

1.672

0.012

0.012

3.31

3.31

yellowish green

Kwale District, Coast Province, Kenya

1.80ct, biaxial -

 

 

 

 

 

 

 

weak yellow

inert

GIA Gem Database  34366

Kornerupine

1.66

1.672

0.012

0.012

3.31

3.31

greenish yellow

Monaragala, Uva Province, Sri Lanka

7.11ct, biaxial -

 

 

 

 

 

 

 

 

 

GIA Gem Database  34069

Kornerupine

1.66

1.673

0.013

0.013

3.272

3.272

green

East Africa

 

 

 

 

 

 

 

 

yellow

yellow

The Journal of Gemmology 1974 N2, p73-75

Kornerupine

1.662

1.675

0.012

0.013

 

 

blue

East Africa (Kenya and Tanzania)

2V : 6-11

1.662

1.663

1.673

1.674

1.674

1.675

 

 

 

Gems & Gemology 1978 winter, p121-122

Kornerupine

1.664

1.686

0.022

0.022

3.33

3.33

greenish brown

Sri Lanka

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p169

Kornerupine

1.665

1.69

0.009

0.013

3.283

3.346

light brownish yellow, brown, green, dark brown, dark greyish green

Embilipitiya, Sri Lanka

 

1.665

1.678

 

 

1.677

1.690

 

 

 

Gems & Gemology 1996 winter, p262-269

Kornerupine

1.665

1.67

0.015

0.015

3.32

3.32

green

 

 

 

 

 

 

 

 

weak 445nm line

 

 

ACAM labo 

Kornerupine

1.665

1.673

0.006

0.008

 

 

 

Greenland

optical sign (-)

1.665

1.665

1.670

1.671

1.671

1.673

 

 

 

The Australian Gemmologist 2010 Vol24, N2, p38-40

Kornerupine

1.666

1.68

0.014

0.014

3.34

3.34

green-brown

 

0.7ct

 

 

 

 

 

 

weak band around 446 nm

 

 

ACAM labo 

Kornerupine

1.666

1.68

0.014

0.014

3.32

3.32

greenish yellow

Embilipitiya, Sabaragamuwa, Sri Lanka

11.19ct, biaxial -

 

 

 

 

 

 

absorption lines at 450 and 510nm

inert

inert

GIA Gem Database  34063

Kornerupine

1.666

1.689

0.023

0.023

3.28

3.28

yellow-green

Mogok, Myanmar

14.19ct, biaxe -

 

 

 

 

 

 

 

very weak green

inert

GIA Gem Database  34565

Kornerupine

1.667

1.68

0.013

0.013

3.314

3.314

 

 

very small 2V angle

1.667

1.667

1.676

1.676

1.680

1.680

 

inert

inert

The Journal of Gemmology 1984 Vol XIX, N4, p312-316

Kornerupine

1.668

1.68

0.012

0.012

3.34

3.36

brownish green to greenish brown

Elahera, Sri Lanka

 

 

 

 

 

 

 

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1985 34, Nr 1/2, p13-19

Kornerupine

1.668

1.68

0.012

0.012

3.33

3.36

brownish green, greenish  brown

Elahera, Sri Lanka

 

1.668

1.668

1.679

1.679

1.680

1.680

503, 446, 430

inert

inert

Gems & Gemology 1986 Summer, p91

Kornerupine

1.67

 

 

 

3.32

3.32

yellowish green

 

cat's-eye, translucent, 1.44ct cabochon, spot RI

 

 

 

 

 

 

 

 

 

Gems & Gemology 2017 Summer, p 230

Kornerupine

1.671

1.673

0.002

0.002

 

 

 

Germany

optical sign (-)

1.671

1.671

1.673

1.673

1.673

1.673

 

 

 

The Australian Gemmologist 2010 Vol24, N2, p38-40

Kornerupine

1.68

1.68

 

 

3.34

3.336

olive to brownish green

Sri Lanka

cat's eye, 2.33 and 3.24 ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2005 Sep, p67-68

Kornerupine

 

 

 

 

3.27

3.27

dark green-blue

Kwakonje, Tanga, Tanzania

4.39ct, biaxial - , cabochon

 

 

 

 

 

 

 

weak yellow

inert

GIA Gem Database  35016

 

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

Kornerupine

1.659

1.699

0.012

0.021

3.27

3.45

1.659

1.682

1.671

1.696

1.672

1.699

http://www.geminterest.com 

Kornerupine

1.66

1.699

0.012

0.017

3.27

3.44

1.660

1.682

 

 

1.674

1.699

Bestimmungstabellen fr Edelsteine, Birgit Gnther, 1981 

Kornerupine

1.66

1.674

0.012

0.017

3.27

3.45

1.660

1.682

 

 

1.674

1.699

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

Kornerupine

1.66

1.684

0.013

0.015

3.2

3.45

1.660

1.671

1.673

1.683

1.675

1.684

Gemmological Tables, Ulrich Henn, 2004 

Kornerupine

1.66

1.682

0.013

0.015

3.28

3.35

1.660

1.669

1.673

1.681

1.674

1.682

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

Kornerupine

1.661

1.699

0.013

0.017

3.27

3.45

 

 

 

 

 

 

http://www.gemmology.be 

Kornerupine

1.661

1.699

0.013

0.017

3.27

3.45

1.661

1.682

1.673

1.696

1.674

1.699

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Kornerupine

1.664

1.683

0.013

0.013

3.25

3.45

1.664

1.670

 

 

1.677

1.683

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Kornerupine

1.665

1.68

0.012

0.013

3.3

3.34

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Kornerupine

1.665

1.68

0.013

0.013

3.28

3.35

1.665

1.668

 

 

1.678

1.680

Gems, R Webster, 5th edition 1994 

Kornerupine

1.674

1.69

0.014

0.017

3.36

3.38

1.674

1.675

1.686

1.687

1.687

1.690

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

Kornerupine

1.682

1.699

0.017

0.017

3.44

3.46

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

kornerupine

blue

Cr+ in octahedral coordination

Gems & Gemology Summer 1988

kornerupine

brownish green

Fe+ and Mn+

The Australian Gemmologist 2010, Vol24, N2, p38-40

kornerupine

green

V+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

graphite

Kornerupine

The Journal of Gemmology 1995, 24,8, p577

rutile

Kornerupine

Gems&Gemology 1996, winter, p262-269

zircon

Kornerupine

Gems&Gemology 1996, winter, p262-269

apatite

Kornerupine

Gems&Gemology 1996, winter, p262-269

quartz

Kornerupine

Gems&Gemology 1996, winter, p262-269

tourmaline

Kornerupine

Gems&Gemology 1996, winter, p262-269

hematite

Kornerupine

Gems&Gemology 1996, winter, p262-269

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Kornerupine

Begogo

Midongy massif

 

Madagascar

The Australian Gemmologist 2010, Vol24,N2, p38-40

Kornerupine

 

Betroka

Tular (Toliara ) Province

Madagascar

Gemmologie, Dez 1999,p196

Kornerupine

Umba Valley

Lelatema Mts

Arusha Region

Tanzania

Gemmologie, 1997, Mar,p31

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

K2O

B2O3

Cl

Kornerupine

medium brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

30.95

43.36

0.05

17.39

5.17

0.06

0.01

0.02

 

 

 

 

 

Kornerupine

dark green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

31.35

43.08

0.1

17.62

5.13

0.01

0.02

0.03

 

 

 

 

 

Kornerupine

green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

30.98

43.37

0.07

17.21

5.4

0.05

0.01

0.02

 

 

 

 

 

Kornerupine

light brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

31.79

44.15

0.03

19.52

1.63

0.04

0.01

0.02

 

 

 

 

 

Kornerupine

dark brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

30.23

44.71

0.05

15.82

6.61

0.1

0.01

0.02

 

 

 

 

 

kornerupine

light brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996, p266

31.79

44.15

0.03

19.52

 

0.04

0.01

0.02

 

1.63

 

 

 

Kornerupine

light green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

31.87

42.36

0.01

19.55

1.85

0

0.01

0.02

 

 

 

 

 

Kornerupine

brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

31.36

44.75

0.02

18.49

2.51

0.05

0.01

0.03

 

 

 

 

 

Kornerupine

green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996 p 266

31.51

42.05

0.05

17.8

4.6

0.04

0.02

0.02

 

 

 

 

 

kornerupine

green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996, p266

30.98

43.37

0.07

17.21

 

0.05

0.01

0.02

 

5.4

 

 

 

kornerupine

dark green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996, p266

31.35

43.08

0.1

17.62

 

0.01

0.02

0.03

 

5.13

 

 

 

Kornerupine

 

Elahera

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1985, 34, Nr1/2, p13-19

30.92

45.97

0.02

16.82

4.12

0.11

0.08

0.1

 

 

0.07

 

 

Kornerupine

 

Embilipitiya

Sri Lanka

The Australian Gemmologist Feb 1986, Vol 16, Nr1, p3

29.04

46

0.05

17.44

3.55

0.1

0.04

 

 

 

 

 

 

Kornerupine

cat's eye

 

East Africa

The Journal of Gemmology 1995, Vol 24, N8, p 574

32.1

44.43

 

19.9

0.17

0.16

0.05

0.02

0.05

 

0.03

3.17

0.18

Kornerupine

 

Embilipitiya

Sri Lanka

The Australian Gemmologist Feb 1986, Vol 16, Nr1, p3

30.39

41.31

0.01

19.08

2.55

 

0.04

 

 

 

 

 

 

kornerupine

green

Embilipitya

Sri Lanka

Gems & Gemology Winter 1996, p266

31.51

42.05

0.05

17.8

 

0.04

0.02

0.02

 

4.6

 

 

 

Kornerupine

 

Embilipitiya

Sri Lanka

The Australian Gemmologist Feb 1986, Vol 16, Nr1, p3

30.33

40.99

0.05

17.91

3.85

0.02

0.04

 

 

 

 

 

 

kornerupine

dark brown

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996, p266

30.23

44.71

0.05

15.82

 

0.1

0.01

0.02

 

6.61

 

 

 

Kornerupine

 

Elahera

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1985, 34, Nr1/2, p13-19

30.92

42.05

0.12

14.85

6.95

0.05

0.06

0.14

 

 

0.04

 

 

kornerupine

medium brown

 

Sri Lanka

Gems & Gemology Winter 1996, p266

30.95

43.36

0.05

17.39

 

0.06

0.01

0.02

 

5.17

 

 

 

kornerupine

light green

Embilipitiya

Sri Lanka

Gems & Gemology Winter 1996, p266

31.87

42.36

0.01

19.55

 

 

0.01

0.02

 

1.85