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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

Forsterite synthetic

1.629

1.67

0.041

0.041

3.25

3.25

bluish

 

 

1.629

1.629

1.650

1.650

1.670

1.670

 

inert

inert

ACAM lab  4653

Forsterite synthetic

1.63

1.67

0.04

0.04

3.15

3.15

pale to deep blue, blue-green, green, pink, purple

 

 

 

 

 

 

 

 

intense absorption up to 450nm, a weak one from there to 500nm, group of 3 bands at 530, 550, and 580 and band at 690

inert

inert

Gems & Gemology 1994 summer 102-108

Forsterite

1.63

1.67

0.04

0.04

3.25

3.25

colourless

Sri Lanka

0.89ct

1.630

1.630

1.648

1.648

1.670

1.670

 

inert

inert

ACAM lab  2276

Forsterite synthetic

1.635

1.671

0.034

0.035

3.23

3.24

violet

 

 

1.635

1.637

1.650

1.650

1.670

1.671

460-470nm band, 490 band, diffuse lines at 510 and 520nm and a 570-580nm band

weak greenish yellow

very weak orangy yellow

Gems & Gemology 1999 summer p139-141

Forsterite synthetic

1.635

1.67

0.035

0.035

3.26

3.26

violet

 

1.65ct; cause of colour: Co

 

 

 

 

 

 

Co-spectrum

strong chalky white

strong chalky white

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Dez, p 234

Forsterite

1.637

1.669

0.032

0.032

3.26

3.26

 

Pamir Mts,Tajikistan

 

 

 

 

 

 

 

 

weak orangy pink

weak red

Gems & Gemology 2008 fall, p265

Forsterite

1.638

1.677

0.039

0.039

3.27

3.27

colourless

Mogok, Birma

 

 

 

 

 

 

 

 

 

 

Gems & Gemology 2008 fall, p263-264

Forsterite

1.639

1.67

0.031

0.031

3.25

3.25

near colourless

Sri Lanka

 

 

 

 

 

 

 

495nm

inert

inert

Gems & Gemology 1999 spring, p50

Forsterite

1.64

1.673

0.032

0.032

3.29

3.29

colourless

Sri Lanka

6.20ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Jul p106

Forsterite

1.645

1.68

0.035

0.035

3.3

3.3

colourless

 

 

 

 

 

 

 

 

 

 

 

ACAM labo 

Peridot - forsterite

1.648

1.689

0.035

0.038

3.29

3.37

 

 

 

1.648

1.653

1.663

1.671

1.683

1.689

453, 477, 497 , weaker at 529

 

 

Gems & Gemology 2004 winter p288-302

Peridot - forsterite

1.648

1.689

0.035

0.038

3.29

337

light yellow-green to olive-green

Nanga Parbat region, Pakistan

 

1.648

1.653

1.663

1.671

1.683

1.689

 

inert

inert

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1995 Sep, p33-60

Peridot - forsterite

1.649

1.691

0.037

0.038

3.28

3.35

 

Arizona, USA

 

1.649

1.653

1.669

1.671

1.686

1.691

 

 

 

The Journal of Gemmology 1998 Vol 26, 2,86-102

Peridot - forsterite

1.649

1.688

0.036

0.036

3.29

3.29

light olivegreen

Lanzarote, Canary Islands, Spain

91.4% forsterite

 

 

 

 

 

 

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1989 Apr, p40-41

Peridot - forsterite

1.649

1.691

0.037

0.038

3.28

3.38

very dark brown to bright lime green

San Carlos Apache Resevation, Gila County, Arizona, USA

 

1.649

1.653

1.665

1.671

1.686

1.691

typical peridot

 

 

Gems & Gemology 1981 Winter p205-214

Peridot - forsterite

1.649

1.682

0.034

0.034

3.36

3.36

light yellowish green

Mogok, Myanmar

0.28ct

 

 

 

 

 

 

 

inert

inert

ACAM Lab  1956

Peridot - forsterite

1.65

1.688

0.037

0.038

3.33

3.35

medium light to medium dark, yellowish-green to brownish-green of low saturation

Lam Dong Province, Vietnam

5 stones : 1.60-5.56 ct; chelsea : yellowish-green

1.650

1.650

1.665

1.667

1.687

1.688

453, 473, 493nm

 

 

The Journal of Gemmology 1995 Vol 24, N°5, p355-361

Peridot - forsterite

1.65

1.685

 

 

 

 

brownish-green

Norway

1.97ct, 6-ray star

 

 

 

 

 

 

band between the green and the blue

 

 

The Journal of Gemmology 1980 Vol 17, N°1, p1-4

Peridot - forsterite

1.65

1.689

0.036

0.038

3.34

3.37

 

Pakistan

1.99-12.41 ct

1.650

1.653

1.668

1.671

1.688

1.689

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1994 Dez, p105

Peridot - forsterite

1.65

1.69

0.038

0.039

3.32

3.36

yellowish green

Sardinia, Italy

biaxe+

1.650

1.652

1.669

1.670

1.688

1.690

450, 473, 490nm

inert

inert

Gems & Gemology 2009 Summer, p130-133

Peridot - forsterite

1.65

1.684

0.034

0.034

3.25

3.25

green

Usambara Mts, Umba District, Tanzania

 

1.650

1.650

1.568

1.658

1.684

1.684

 

 

 

Gems & Gemology 1983 Summer p103-107

Peridot - forsterite

1.65

1.688

0.037

0.038

3.33

3.35

yellowish green to brownish green

Vietnam

 

1.650

1.650

1.665

1.667

1.687

1.688

453, 473, 493nm bands

 

 

Gems & Gemology 1993 fall, p211-212

Peridot - synthetic

1.65

1.68

0.03

0.03

3.3

3.3

pale green

 

 

 

 

 

 

 

 

 

 

 

Gems & Gemology 1994 summer 102-108

Peridot - forsterite

1.65

1.69

0.036

0.038

3.32

3.37

yellowish green to olive green or brownish green

Central Highlands, Vietnam

biaxial -

1.650

1.652

1.665

1.669

1.686

1.690

 

inert

inert

Gems & Gemology 2012 Fall, p172

Peridot - forsterite

1.65

1.703

0.036

0.036

3.28

3.49

Light yellowish green to a darker, richer yellowgreen, olive green, and brownish green

Vietnam

 

1.650

1.667

1.665

1.669

1.686

1.703

bands at 455 and 484 nm with total absorption below about 440

inert

inert

Gems & Gemology 2016 Fall, p 276-287

Peridot - forsterite

1.651

1.687

0.036

0.036

3.35

3.35

 

Pakistan

5.23-18.37ct

1.651

1.651

1.669

1.669

1.687

1.687

bands 453, 477, 497nm

inert

inert

Gems & Gemology 1994 winter, p275

Peridot - forsterite

1.651

1.69

0.039

0.039

3.36

3.36

 

Sri Lanka

 

1.651

1.651

1.660

1.660

1.690

1.690

 

 

 

The Journal of Gemmology 1985 Vol 19, No 8, p692-701

Peridot - forsterite

1.651

1.688

0.037

0.037

3.39

3.39

yellowish green

Zabargad Island, Egypt

19.46ct, biaxial +

 

 

 

 

 

 

broad absorption below 420nm, lines at 455, 475, 497nm

inert

inert

GIA Gem Database  33885

Peridot - forsterite

1.651

1.685

0.033

0.033

 

 

green

Chihuahua, Mexico

 

1.651

1.652

1.668

1.669

1.684

1.685

 

 

 

The Journal of Gemmology 1978 N°4, p236

Peridot - forsterite

1.652

1.69

0.036

0.037

3.35

3.35

 

Eritrea

 

1.652

1.653

 

 

1.688

1.690

Fe²+ spectrum

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Sep , p121

Peridot - forsterite

1.652

1.69

0.034

0.036

3.34

3.36

 

Zhanjikou, Hebei Province, ChinaChina

91% forsterite - 9% fayalite

1.652

1.654

1.670

1.672

1.688

1.690

Fe²+

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Jul p113-116

Peridot - forsterite

1.652

1.688

0.036

0.036

3.34

3.35

yellowish green

Cambodia

biaxial +

 

 

 

 

 

 

453, 473, 493nm lines

inert

inert

The Australian Gemmologist 2011 Apr-Jun, p152

Peridot - forsterite

1.652

1.689

0.037

0.037

3.35

3.35

green

Pakistan

6.73ct, with vonsenite inclusions

1.652

1.652

1.671

1.671

1.689

1.689

 

inert

inert

ACAM Lab

Peridot - forsterite

1.652

1.689

0.037

0.037

3.33

3.33

green

Arizona, USA

1.29ct, chalcopyrite inclusions

1.652

1.652

1.670

1.670

1.689

1.689

 band at 496.0 nm and a weaker zone at 488.0 nm. A line is visible at 473.0 nm, while a weak band, centred at 452.0

 

 

The Journal of Gemmology 1987 Vol20, N°5, p272-273

Forsterite

1.653

1.706

0.034

0.036

3.33

3.43

green to brown

Eifel, Germany

 

1.653

1.670

1.667

1.688

1.687

1.706

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Jun, p91-92

Peridot - forsterite

1.653

1.689

0.036

0.036

3.34

3.35

 

Ross Island, Antarctic

 

 

 

 

 

 

 

 

 

 

The Australian Gemmologist 1974 14(4),124

Peridot - forsterite

1.653

1.689

0.036

0.036

3.36

3.36

light yellow green, yellow green

Zhangjikou-Xuanhua area, Hubei Province, China

formed in an alkali basalt

1.653

1.653

1.670

1.670

1.689

1.689

typical peridot

 

 

Gems & Gemology 1986 spring p38-40

Peridot - forsterite

1.655

1.69

0.035

0.035

 

 

brown

Chihuahua, Mexico

 

1.655

1.655

1.673

1.673

1.690

1.690

 

 

 

The Journal of Gemmology 1978 N°4, p236

Peridot - forsterite

1.656

1.699

0.033

0.038

3.351

3.388

light yellowish green to dark brown

Black Rock Summit, Nye County, Nevada, USA

0.55 tot 15.90 ct

1.656

1.660

1.674

1.678

1.694

1.699

bands in 453, 474, 495 and 635

inert

inert

The Journal of Gemmology 1998 Vol 26, N°2, p86-102

Peridot - forsterite

1.658

1.696

0.034

0.037

3.34

3.37

green

Pallasite from Esqual, Patagonia, Argentina

84%forsterite, 15.5% fayalite

1.658

1.660

1.671

1.673

1.693

1.696

 

 

 

The Journal of Gemmology 1992 Vol23, N°2, p87

Forsterite

1.659

1.718

0.032

0.033

3.493

3.51

green-yellowish, green-brownish

Sri Lanka

 

1.659

1.685

1.673

1.711

1.691

1.718

453nm, 473nm, 493nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002 Mar, p29-39

Peridot - forsterite

1.659

1.705

0.034

0.036

3.415

3.499

light greenish yellow to yellowish green, medium dark slightly brownish yellowish green, dark yellowish brown

Kilbourne Hole, Dona Ana County, New Mexico, USA

 

1.659

1.669

1.674

1.684

1.693

1.705

 

 

 

Gems & Gemology 1992 Spring p 16-27

dunilite - forsterite

1.663

1.719

0.037

0.039

3.47

3.55

brown-yellow, greenish-yellow, greenish-brown

Kolonne, Embilibitiya, Sri Lanka

 

1.663

1.680

 

 

1.700

1.719

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2009 58/3-4/Dec, p86

dunilite - forsterite

1.678

1.715

0.037

0.037

3.53

3.53

yellowish brown

Ratnapura, Sri Lanka

0.23ct

1.678

1.678

1.697

1.697

1.715

1.715

 

inert

inert

ACAM Lab  2275

Peridot - forsterite

 

 

 

 

 

 

 

 

interplanetary cat's eye peridote

 

 

 

 

 

 

 

 

 

Gems & Gemology 2008 summer p177

 

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

Peridot - forsterite

1.634

1.71

0.036

0.036

3.27

3.48

1.634

1.674

 

 

1.670

1.710

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Peridot - forsterite

1.634

1.71

0.035

0.038

3.27

3.48

 

 

 

 

 

 

Gemology Tools Professional 2010

Forsterite

1.634

1.678

0.031

0.04

3.21

3.3

 

 

 

 

 

 

Gemmo.eu 

Forsterite synthetic

1.634

1.671

0.031

0.04

3.15

3.3

 

 

 

 

 

 

Gemmo.eu 

Forsterite

1.635

1.67

0.035

0.035

3.22

3.22

 

 

 

 

 

 

http://www.gemmology.be 

Forsterite

1.635

1.67

0.035

0.035

3.22

3.22

1.635

1.635

1.651

1.651

1.670

1.670

http://www.geminterest.com 

Forsterite

1.635

1.69

0.033

0.039

3.2

3.45

1.635

1.655

1.651

1.657

1.670

1.690

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Forsterite

1.635

1.677

0.032

0.039

3.21

3.24

1.635

1.638

1.651

1.651

1.669

1.677

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

Forsterite synthetic

1.635

1.67

0.035

0.035

3.26

3.26

1.635

1.635

1.651

1.651

1.670

1.670

Gemmological Tables, Ulrich Henn, 2004 

Forsterite synthetic

1.635

1.67

0.032

0.035

3.21

3.24

1.635

1.640

1.641

1.654

1.670

1.670

http://www.geminterest.com 

Forsterite synthetic

1.635

1.671

0.034

0.035

3.23

3.26

1.635

1.637

 

 

1.670

1.671

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Forsterite synthetic

1.635

1.67

0.035

0.035

3.21

3.23

 

 

 

 

 

 

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

Peridot - forsterite

1.64

1.703

0.034

0.038

3.2

3.5

1.640

1.654

 

 

1.681

1.703

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

Peridot - forsterite

1.64

1.69

0.033

0.038

3.22

3.35

 

 

 

 

 

 

http://www.gemmology.be 

Peridot - forsterite

1.64

1.69

0.033

0.04

3.2

3.48

1.640

1.655

1.657

1.673

1.675

1.690

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

Peridot - forsterite

1.647

1.706

0.035

0.04

3.26

3.49

 

 

 

 

 

 

Gemmo.eu 

Peridot - forsterite

1.65

1.695

0.036

0.038

3.27

3.43

1.650

1.657

1.668

1.673

1.686

1.695

Gemmological Tables, Ulrich Henn, 2004 

Peridot - forsterite

1.65

1.705

0.017

0.04

3.22

3.48

1.650

1.665

1.660

1.690

1.680

1.705

http://www.geminterest.com 

Peridot - forsterite

1.654

1.689

0.038

0.038

3.34

3.34

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Peridot - forsterite

1.654

1.706

0.034

0.038

3.28

3.48

1.640

1.667

 

 

1.686

1.706

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Peridot - forsterite

1.654

1.689

0.036

0.036

3.34

3.34

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Forsterite synthetic

blue

Co²+

Gemmologie Dez 1999,p234

Peridot - forsterite

green

Fe²+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

anhydrite

Peridot - forsterite

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

antigorite

Peridot - forsterite

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

apatite

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

augite

Peridot - forsterite

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

biotite

Peridot - forsterite

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

bornite

Peridot - forsterite

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

bradleyite

Peridot - forsterite

S. V. Sokolov, S. A. Yarmishko, and A. V. Fedorov, Gemological Bulletin,No. 3, 2002, pp. 49–54

calcite

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

chalcopyrite

Peridot - forsterite

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

chromite

Peridot - forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

chrysotile

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

chrysotile

Peridot - forsterite

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

diopside

Peridot - forsterite

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

dolomite

Peridot - forsterite

S. V. Sokolov, S. A. Yarmishko, and A. V. Fedorov, Gemological Bulletin, No. 3, 2002, pp. 49–54

goethite

Peridot - forsterite

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

hercynite

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

hercynite

Peridot - forsterite

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

ludwigite

Peridot - forsterite

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

magnetite

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

millerite

Peridot - forsterite

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

pentlandite

Peridot - forsterite

The Journal of Gemmology, 1998, Vol 26, N°2, p86-102

peridot

Peridot - forsterite

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

picotite

Peridot - forsterite

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

pyrrhotite

Peridot - forsterite

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

saponite

Forsterite

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2002, Mar, p29-40

sphalerite

Peridot - forsterite

Gems & Gemology Fall 2012, p172

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

peridot-Forsterite

Lightning Peak

Cherryville

British Columbia

Canada

Gems & Gemology winter 2000 p320

peridot-Forsterite

Xuanhua

Zhangjiakou Prefecture

Hebei Province

China

Gems & Gemology winter 2000 p320

peridot-Forsterite

Baishishan

Changbaishan

Jilin

China

Gems & Gemology winter 2000 p320

peridot-Forsterite

 

Zabargad

Red Sea

Egypt

Gems & Gemology 1981 Spring p 2

peridot-Forsterite

Bernardmyo

Mogok

Mandalay

Myanmar

Gems & Gemology winter 2000 p320

Forsterite

Aheim Olivine Quarry, Almklovdalen

Vanylven

More og Romsdal

Norway

Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p. 130

peridot-Forsterite

Sapat Gali (Soppat; Suppat; Sumpat), Manshera

Naran-Kagan Valley

Kohistan District

Pakistan

Mineralogical Record 3/1997

peridot-Forsterite

Khungtukun Massif, Malaya Romanikha River, Khatanga, Taimyr Peninsula, Taimyr Autonomous Region

Krasnoyarsk Territory

Eastern Siberia Region

Russia

Gems & Gemology 2000 winter p320

peridot-Forsterite

Embilipitiya

Monaragata

Southern Province

Sri Lanka

Gems & Gemology 2000 winter p320

peridot-Forsterite

Kollonne

Ratnapura

Southern Province

Sri Lanka

Gems & Gemology 2000 winter p320

peridot-Forsterite

Kingiti

Mpapwa

 

Tanzania

Gems & Gemology winter 2000 p321

peridot-Forsterite

 

Tunduru-Songea area

Ruvuma Region

Tanzania

Gemmologie, 1997, Mar,p31

peridot-Forsterite

San Carlos, San Carlos Indian Reservation

Gila County

Arizona

USA

Gems & Gemology 1981 Spring p 8

peridot-Forsterite

Kilbourne Hole

Dona Ana County

New Mexico

USA

Gems & gemology spring 1992 p16-27

peridot-Forsterite

 

Gai Lai (Pleiku)

Annam Highlands

Vietnam

Gems & Gemology winter 2000 p320

peridot-Forsterite

 

Di Linh

Lam Dong

Vietnam

Gems & Gemology winter 2000 p320

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Cr2O3

V2O3

ZnO

NiO

Peridot - forsterite

 

Pallasite from Esqual, Patagonia

Argentina

The Journal of Gemmology 1992, Vol 23, N°2 p87

40.69

 

0.34

43.13

14.21

 

 

 

 

 

 

Peridot - forsterite

 

Pallasite from Esqual, Patagonia

Argentina

The Journal of Gemmology 1992, Vol 23, N°2 p87

40.75

 

0.38

43.28

14.02

 

 

 

 

 

 

Peridot - forsterite

 

Pallasite from Esqual, Patagonia

Argentina

The Journal of Gemmology 1992, Vol 23, N°2 p87

41.09

 

0.32

43.49

13.57

 

 

 

 

 

 

Peridot - forsterite

green

 

China

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Jul p115

41.28

0.01

0.13

50.1

8.55

 

0.06

0.01

 

 

0.36

Peridot - forsterite

green

 

China

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Jul p115

41.45

0.02

0.13

49.02

8.7

0.01

0.04

0.02

 

 

0.37

Peridot - forsterite

 

Zabargad

Egypt

Gems & Gemology 1983 Summer p104-105

41.07

 

0.11

50.44

8.14

 

0.04

 

 

 

0.38

Peridot - forsterite

 

Zabargad

Egypt

Gems & Gemology 1983 Summer p104-105

41.03

 

0.13

50.95

7.95

 

0.03

 

 

 

0.41

Peridot - forsterite

 

Zabargad

Egypt

The Journal of Gemmology , Vol 19, No 8 p694

41.6

 

0.1

49.7

9.6

 

 

 

 

 

0.33

Peridot - forsterite

green

Eifel

Germany

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

39.51

0.04

0.27

44.06

15.43

 

0.27

 

 

 

0.1

Peridot - forsterite

 

Sardinia

Italy

Gems & Gemology 2009 Summer p132

40.83

 

0.15

50.15

8.98

 

 

 

 

 

0.39

Peridot - forsterite

 

Sardinia

Italy

Gems & Gemology 2009 Summer p132

40.69

 

0.11

50.17

8.77

 

 

 

 

 

0.38

Peridot - forsterite

 

 

Mexico

Gems & Gemology 1983 Summer p104-105

40.79

 

0.11

49.24

9.22

 

0.07

 

 

 

0.4

Peridot - forsterite

 

 

Mexico

The Journal of Gemmology , Vol 19, No 8 p694

41.96

 

0.1

49.39

8.67

 

0.16

0.06

 

 

 

Peridot - forsterite

 

 

Mexico

The Journal of Gemmology , Vol 19, No 8 p694

41.32

 

0.14

49.8

8.62

0.01

0.06

 

 

 

 

Peridot - forsterite

 

 

Myanmar

Gems & Gemology 1983 Summer p104-105

40.81

 

0.09

49.51

10.06

 

 

 

 

 

0.33

Peridot - forsterite

 

 

Myanmar

Gems & Gemology 1983 Summer p104-105

40.8

 

0.1

50.28

8.25

 

0.09

 

 

 

0.35

Peridot - forsterite

 

 

Myanmar

Gems & Gemology 1983 Summer p104-105

40.75

 

0.07

50.71

8.58

 

 

 

 

 

0.39

Peridot - forsterite

 

 

Myanmar

Gems & Gemology 1983 Summer p104-105

40.25

 

0.15

48.9

10.16

 

 

 

 

 

0.31

Peridot - forsterite

 

 

Norway

Gems & Gemology 1983 Summer p104-105

41.19

 

0.06

51.63

6.94

 

 

 

 

 

0.29

Peridot - forsterite

 

 

Norway

Gems & Gemology 1983 Summer p104-105

41.18

 

0.08

51.76

6.95

 

 

 

 

 

0.43

Peridot - forsterite

green

Nanga Parbat region

Pakistan

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

40.96

 

0.16

49.58

8.73

 

 

0.02

 

 

0.32

Peridot - forsterite

green

Nanga Parbat region

Pakistan

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

41.09

 

0.15

50.44

7.29

 

 

 

 

 

0.26

Peridot - forsterite

green

Nanga Parbat region

Pakistan

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

41.9

 

0.18

51.69

6.15

 

 

 

 

 

0.26

Peridot - forsterite

green

Nanga Parbat region

Pakistan

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

42.48

 

0.18

52.57

4.95

 

 

 

 

 

0.26

Peridot - forsterite

green

 

Sri Lanka

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1995, Sep, p41

42.09

 

0.09

53.62

4.02

 

0.04

 

0.11

 

 

Forsterite

green-brownish

 

Sri Lanka

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2002, Mar, p33

38.45

 

29

40.14

21.15

 

0.13

 

 

 

 

Forsterite

green-yellowish

 

Sri Lanka

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2002, Mar, p33

39.45

 

0.19

45.69

14.41

 

0.1

 

 

 

 

Peridot - forsterite

 

 

Sri Lanka

The Journal of Gemmology , Vol 19, No 8 p694

40.62

 

0.27

48.11

10.81

 

0.14

 

 

 

 

Peridot - forsterite

green

 

Tanzania

Gems & Gemology 1983 Summer p104-105

40.62

 

0.12

51.26

7.74

 

 

 

 

 

0.39

Peridot - forsterite

 

Arizona

USA

Gems & Gemology 1983 Summer p104-105

40.56

 

0.17

48.25

11.18

 

0.07

 

 

 

0.36

Peridot - forsterite

 

Arizona

USA

Gems & Gemology 1983 Summer p104-105

40.77

 

0.17

48.22

9.68

 

0.06

 

 

 

0.39

Peridot - forsterite

 

Arizona

USA

Gems & Gemology 1983 Summer p104-105

40.55

 

0.12

48.89

9.73

 

0.11

 

 

 

0.37

Peridot - forsterite

 

Arizona

USA

The Journal of Gemmology , Vol 19, No 8 p694

41.39

 

0.11

48.5

9.71

0.02

0.1

0.04

 

 

 

Peridot - forsterite

 

Arizona

USA

The Journal of Gemmology , Vol 19, No 8 p694

41.57

 

0.12

48.47

10.37

0.01

0.009

0.03

 

 

 

Peridot - forsterite

 

Arizona

USA

The Journal of Gemmology , Vol 19, No 8 p694

41.62

 

0.18

48.34

8.67

0.01

0.1

0.04

 

 

 

Peridot - forsterite

 

Arizona

USA

The Journal of Gemmology , Vol 19, No 8 p694

41.11

 

0.09

49.49

9.07

0.02

0.09

0.04

 

 

 

Peridot - forsterite

 

Black Rock Summit, Nye County, Nevada

USA

The Journal of Gemmology 1998, Vol26, N°2, p86-102

40.55

1.62

0.16

47.43

10.27

 

 

 

 

 

 

Peridot - forsterite

 

Black Rock Summit, Nye County, Nevada

USA

The Journal of Gemmology 1998, Vol26, N°2, p86-102

40.05

0.08

0.16

47.34

11.79

 

0.22

 

 

 

0.28

Peridot - forsterite

 

Black Rock Summit, Nye County, Nevada

USA

The Journal of Gemmology 1998, Vol26, N°2, p86-102

37.9

 

0.2

47.62

13.81

 

0.15

0.034

 

0.008

0.27

Peridot - forsterite

 

Dak Lak

Vietnam

Gems & Gemology Fall 2012, p173

41.78

 

0.15

49.95

8.49

 

0.04

0.04

 

 

0.36

Peridot - forsterite

 

Gia Lai

Vietnam

Gems & Gemology Fall 2012, p173

41.95

0.01

0.11

50.07

8.47

 

0.05

0.03

 

 

0.37

Peridot - forsterite

 

Lam Dong

Vietnam

Gems & Gemology Fall 2012, p173

41.74

 

0.12

49.99

8.48

 

0.05

0.04

 

 

0.37

Peridot - forsterite

 

 

Vietnam

Gems & Gemology 2016 Fall, p 283

41.02

 

0.12

50.36

8.68

 

0.06

 

 

 

0.36