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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

Enstatite

1.65

1.658

0.008

0.008

3.194

3.194

colourless

Embilipitiya, Sri Lanka

 

 

 

 

 

 

 

band 506nm

 

 

Gems & Gemology 1996 winter, p262-269

Enstatite

1.65

1.684

0.008

0.009

3.201

3.286

colourless, brown

Embilipitiya, Sri Lanka

 

1.650

1.660

 

 

1.674

1.684

strong line at 506nm, distinct 544nm line

 

 

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

Enstatite

1.65

1.661

0.011

0.011

3.2

3.2

yellow-brown

Tanzania

 

1.650

1.650

1.654

1.654

1.661

1.661

line at 506nm

inert

inert

http://www.geminterest.com 2008

Enstatite

1.652

1.662

0.01

0.01

3.23

3.23

yellowish green

Mairimba Hill, Kenya

 

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1982 Vol18, N°2, p118-120

Enstatite

1.652

1.662

0.01

0.01

3.27

3.27

dark reddish orange

Tanga region, Tanzania

13.38ct, biaxial +

 

 

 

 

 

 

lines at 435, 450, 475, 485, 510, 550nm

inert

inert

GIA Gem Database  35004

Enstatite

1.653

1.663

0.01

0.01

3.25

3.25

brown

Tanzania

 

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1982 Vol18, N°2, p118-120

Enstatite

1.653

1.662

0.009

0.009

3.24

3.24

dark brownish yellow

Madagascar

9.15ct, biaxial -

 

 

 

 

 

 

broad absorption below 460nm, lines at 487, 510, 550nm

inert

inert

GIA Gem Database  34413

Enstatite

1.654

1.664

0.01

0.01

3.28

3.28

yellowish brown

Tanzania

 

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1982 Vol18, N°2, p118-120

Enstatite

1.655

1.668

0.013

0.013

3.21

3.21

green

 

0.1ct

 

 

 

 

 

 

weak 506nm

 

 

ACAM labo 

Enstatite

1.657

1.666

0.009

0.009

3.24

3.24

colourless

Sri Lanka

1.49ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Jul p106

Enstatite

1.658

1.669

0.01

0.01

3.25

3.25

 

Embilipitiya, Sri Lanka

largest 19.5ct

1.657

1.659

 

 

1.667

1.669

 

 

 

The Journal of Gemmology 1985 Vol 19, No 5, p419-425

Enstatite

1.658

1.668

0.01

0.01

3.25

3.25

near-colourless

Sri Lanka

 

1.658

1.658

1.661

1.661

1.668

1.668

506nm line, very faint lines at 510 and 502nm, weak band around 543nm

 

 

The Journal of Gemmology 1982 Vol18, N°3, p213-216

Enstatite

1.66

1.671

0.011

0.011

3.28

3.28

brown

 

 

 

 

 

 

 

 

506nm

 

 

ACAM labo 

Enstatite

1.66

1.669

0.009

0.009

3.29

3.29

yellowish green

Mogok, Myanmar

1.50ct

 

 

 

 

 

 

line at 510nm

inert

inert

GIA Gem Database  34561

Bronzite - enstatite

1.66

1.675

0.015

0.015

3.31

3.31

brown

 

1.14 ct

1.660

1.660

1.668

1.668

1.675

1.675

510 nm

inert

inert

ACAM lab  1766

Enstatite

1.661

1.667

0.006

0.006

3.28

3.28

yellow-brown

 

0.9ct

 

 

 

 

 

 

506nm line, 540nm

 

 

ACAM labo 

Enstatite

1.661

1.671

0.01

0.01

3.33

3.33

brown, transparent

Tanzania

2.05ct

 

 

 

 

 

 

strong band 506nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p123

Enstatite

1.662

1.673

0.011

0.011

3.33

3.41

orangish-brown

East Africa

46.45ct

1.662

1.662

1.667

1.667

1.673

1.673

sharp line 506nm

inert

inert

The Journal of Gemmology 1988 Vol 21, N°2, p92-94

Enstatite

1.663

1.671

0.008

0.008

3.26

3.26

dark yellowish green

Maktau, Kenya

 

 

 

 

 

 

 

small band at 506nm

inert

inert

Gems & Gemology 2012 Spring, p65-66

Enstatite

1.663

1.677

0.014

0.014

3.25

3.25

yellowish brown

Sri Lanka

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1976 25, 3, p153-155

Enstatite

1.665

1.675

0.01

0.01

3.31

3.31

dark yellow-green

Balluchistan, Pakistan

 

 

 

 

 

 

 

506nm line, band 548

inert

inert

Gems & Gemology 2009 Fall, p219

Enstatite

1.665

1.675

0.01

0.01

3.25

3.25

green

Tanzania

 

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1982 Vol18, N°2, p118-120

Enstatite

1.668

1.68

0.012

0.012

3.39

3.39

greenish brown

Sri Lanka

 

 

 

 

 

 

 

absorption at 505nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p169

Bronzite - enstatite

1.68

1.693

0.013

0.013

3.41

3.41

 

Sri Lanka

78.39% enstatite, asterism (caused by hollow tubes)

1.680

1.680

1.689

1.689

1.693

1.693

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Sep, p 145-148

Enstatite

1.685

1.697

0.012

0.012

3.35

3.35

brown

Norway

20.89 ct, star-effect caused by ilmenite needles

1.685

1.685

1.693

1.693

1.697

1.697

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2016 Jun, p23-30

 

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

Enstatite

1.648

1.681

0.008

0.012

3.09

3.5

 

 

 

 

 

 

Gemmo.eu 

Enstatite

1.649

1.68

0.01

0.01

3.2

3.3

1.649

1.667

1.653

1.671

1.657

1.680

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

Enstatite - colourless

1.65

1.659

0.009

0.009

3.22

3.22

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Enstatite

1.65

1.678

0.009

0.016

3.1

3.3

1.650

1.666

 

 

1.660

1.678

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

Enstatite

1.65

1.68

0.01

0.01

3.2

3.3

 

 

 

 

 

 

http://www.gemmology.be 

Enstatite

1.65

1.68

0.009

0.011

3.2

3.3

1.650

1.665

1.653

1.671

1.658

1.680

http://www.geminterest.com 

Enstatite

1.65

1.68

0.01

0.01

3.2

3.3

1.650

1.665

1.653

1.671

1.658

1.680

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Enstatite

1.65

1.673

0.009

0.01

3.22

3.28

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Enstatite

1.65

1.68

0.01

0.015

3.2

3.3

1.650

1.665

1.653

1.671

1.658

1.680

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

Enstatite

1.652

1.69

0.01

0.012

3.23

3.28

1.652

1.678

1.654

1.680

1.662

1.690

Gemmological Tables, Ulrich Henn, 2004 

Enstatite

1.653

1.673

0.009

0.01

3.23

3.28

1.653

1.663

 

 

1.663

1.673

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Enstatite

1.653

1.683

0.008

0.011

3.23

3.4

 

 

 

 

 

 

Gemology Tools Professional 2010

Enstatite

1.657

1.69

0.009

0.012

3.19

3.28

1.650

1.678

 

 

1.658

1.690

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Bronzite - enstatite

1.66

1.703

0.009

0.014

3

3.5

1.660

1.686

 

 

1.667

1.703

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

Bronzite - enstatite

1.663

1.693

0.01

0.014

3.25

3.41

1.663

1.680

 

 

1.677

1.693

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Bronzite - enstatite

1.663

1.688

0.009

0.014

3.25

3.35

1.663

1.673

1.669

1.681

1.677

1.688

Gemmological Tables, Ulrich Henn, 2004 

Bronzite - enstatite

1.663

1.693

0.013

0.014

3.25

3.41

1.663

1.680

1.669

1.689

1.677

1.693

Gems, R Webster, 5th edition 1994 

Enstatite

1.663

1.673

0.1

0.1

3.26

3.3

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Bronzite - enstatite

1.665

1.703

0.015

0.015

3.3

3.43

1.665

1.686

 

 

1.680

1.703

http://www.geminterest.com 

Bronzite - enstatite

1.665

1.703

0.015

0.015

3.3

3.43

1.665

1.686

 

 

1.680

1.703

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Bronzite - enstatite

1.665

1.703

0.015

0.017

3.3

3.43

1.665

1.686

 

 

1.680

1.703

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

Bronzite - enstatite

1.665

1.703

0.01

0.018

3.2

3.96

 

 

 

 

 

 

Gemology Tools Professional 2010

Bronzite - enstatite

 

 

0.014

0.014

3.3

3.4

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Enstatite

greenish brown

Fe²+

Gems & Gemology Summer 1988

Enstatite

green

Fe²+ with minor Cr³+

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

Quartz

Enstatite

Gems & Gemology, 1996,winter, p262-269

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Enstatite

 

Mairimba Hill

 

Kenya

The Journal of Gemmology 1982, Vol 18, N°2, p118-120

Enstatite

Merelani Hills (Mererani), 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

Bronzite - enstatite group

brown

 

Brazil

Gems & Gemology 1975, Winter, p120

56.72

0.58

0.21

32.57

10.28

0.02

0.24

0.02

 

Enstatite

 

 

East Africa

Gems & Gemology 1983 Summer p107

53.93

7.1

1.12

32.71

4.49

0.09

0.14

 

0.09

Enstatite

orangish-brown

 

East Africa

The Journal of Gemmology 1988, Vol21, N°2, p94

56.99

0.74

0.18

33.78

7.45

0.04

0.36

 

0.08

Bronzite - enstatite group

greenish-brown

 

India

Gems & Gemology 1975, Winter, p120

55.93

0.63

0.24

31.19

9.78

0.03

0.26

0.03

 

Bronzite - enstatite group

brown

 

India

Gems & Gemology 1975, Winter, p120

57.69

0.57

0.24

32.42

10.55

0.04

0.25

0.03

 

Enstatite

yellowish green

Mairimba Hill

Kenya

The Journal of Gemmology 1982, Vol 18, N°2, p120

55.57

3.6

 

38.27

1.45

 

 

 

0.22

Enstatite

brown

 

Norway

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Jun 2016, p24

49.73

5.7

0.19

25.86

15.72

 

0.27

 

 

Bronzite - enstatite group

 

 

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1991, Sep, p147

52.42

3.1

0.34

29.06

14.21

 

0.33

 

 

Enstatite

brownish-green

 

Sri Lanka

Gems & Gemology 1975, Winter, p120

58.14

0.81

0.15

35.35

5.2

0.02

0.52

0.03

 

Enstatite

colourless

Embilipitiya

Sri Lanka

The Journal of Gemmology 1985, Vol 19 No 5 p425

58.9

1.7

 

38

1

0.03

0.1

0.02

 

Enstatite

colourless

Embilipitiya

Sri Lanka

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

59.24

1.48

0.01

37.05

1.61

0.04

0.04

 

 

Enstatite

colourless

Embilipitiya

Sri Lanka

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

59.26

1.47

0.01

36.87

1.61

0.06

0.04

 

 

Enstatite

reddish brown

Embilipitiya

Sri Lanka

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

54.28

2.38

0.11

27.27

14.48

0.04

0.11

 

 

Enstatite

colourless

Embilipitiya

Sri Lanka

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

60

0.43

0.01

37.76

1.06

0.06

0.06

 

 

Enstatite

greenish

Ratnapura

Sri Lanka

The Journal of Gemmology 1985, Vol 19 No 5 p425

55

6.6

0.1

32.8

5.5

0.15

0.1

0.04

0.02

Enstatite

brown

 

Tanzania

Gems & Gemology 1975, Winter, p120

59.17

1.33

0.08

38

1.95

0.03

0.07

0.05

 

Enstatite

dark green

Arizona

USA

Gems & Gemology 1975, Winter, p120

56.44

3.22

0.15

33.46

5.72

0.1

1.46

0.08

 

Bronzite - enstatite group

dark green

Arizona

USA

Gems & Gemology 1975, Winter, p120

56.23

3.51

0.14

33.17

6.8

0.2

0.99

0.15