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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Spessartine

1.777

1.785

4.02

4.08

orange

Loliondo,Tanzania

76.1% spessartine, 19.3% pyrope, 4.3% grossular

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2010 Jun, p3-18

Spessartine

1.78

1.78

4.04

4.04

 

Loliondo, Tanzania

between  pyrop-spessartine and spessartine

bands at 460, 480 and 520, cutoff at 435

inert

inert

Gems & Gemology 2008 spring p 76-78

Spessartine

1.789

1.79

4.12

4.14

 

Kunene, Namibia

 

dominant lines at about 412, 424, 432 (edge), 462, and 485 nm as well as a line at 495 nrn

 

 

Gems & Gemology 1996 Spring, p56-57

Spessartine

1.79

1.796

4.04

4.15

 

Kunene, Namibia

84% spessartine, 12.6% pyrope, 1.9% almandine, 1.3% grossular; "hollandine"

Mn²+

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1993 Sep, p64

Spessartine

1.79

1.797

4.09

4.15

orange

Marienfluss, Kunene Region, Namibia

spessartine component : 84-86%, discovered in 1992

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1994 Jun, p39-47

Spessartine

1.791

1.791

4.1

4.1

orange

Namibia

3.93ct, "Hollandine"

cutoffa t about 445 nm, a
distinct above 460 nm, diffused band between 480 and 490 nm, a weak diffused bank from about 525 to 545 nm

 

 

Gems & Gemology 1993 Spring, p61

Spessartine

1.799

1.808

4.19

4.26

 

Ramona, San Diego County, California, USA

 

cutoff 435-440, bands 460, 480-485, 520-525; 504line

 

 

Gems & Gemology 2001 summer p278-294

Spessartine

1.799

1.8

4.2

4.25

orange

Lundazi area, Zambia

2.09 - 11.03 ct

cutoff at 435 nm; bands at 460, 480, and 530 nm; and a weak 504 nm line

inert

inert

Gems & Gemology 1999 Winter, p217

Spessartine

1.8

1.81

4.1

4.25

bicoloured orange and orangy brown

Galilea pegmatite region near Governador Valadares, Brazil

up to 5.61ct

 

 

 

Gems & Gemology 2002 Fall, p269-270

Spessartine

1.8

1.808

4.15

4.22

bright yellowish-orange, orange to orange-brown, red

Madagascar

 

 

 

 

The Journal of Gemmology 2002 Vol28, N°4-236

Spessartine

1.8

1.8

4.19

4.2

slightly yellowish orange to brownish orange

Azad Kashmir, Pakistan

transparent, "Kashmirine garnets"

bands 410,420 and 430nm

inert

inert

Gems & Gemology 1996 Fall, p 218-219

Spessartine

1.801

1.803

4.15

4.22

yellow, yellow-orange, brown-orange

Nigeria

tabby extinction under crossed polarizing filters, variation of almandine component 1% to 6% is responsible for the variation of colour

 

 

 

The Journal of Gemmology 2000 Vol27, N°3,p 129-132

Spessartine

1.801

1.803

4.18

4.23

yellow-orange to red-orange

Nigeria

84-94% spessartine, 3.5% pyrope, 1.5-11% almandine

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Dez, p223-226

Spessartine

1.805

1.811

4.2

4.25

brown to reddish brown

Altai, China

 

 

inert

inert

Gems & Gemology 1993 winter, p273-277

Spessartine

1.82

1.82

4.26

4.26

yellow-orange

Namibia

1.1 ct

 

inert

inert

ACAM lab  4594

Spessartine

 

 

4.15

4.18

 

Mozambique

 

408, 422, 428, 460, 483 and 524nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Jun, p61

Spessartine

 

 

4.16

4.16

 

Turkey

 

410, 420, 430, 460, 481nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1997 Sep, p126

Spessartine

 

 

4.19

4.21

yellow-brown

Congo

0.62 - 0.84 ct, IR OTL

strong absorptions at 409, 430, 461, 485 and 527nm

 

 

The Journal of Gemmology 2014 Vol 34, N°4, p 299

Spessartine

 

 

4.22

4.22

reddish orange

Myanmar

6.66ct

440 nm cutoff (due to Mn2+), a weak 520 nm line (Fe2+), and weak bands at 570, 615, and 690 nm (Fe2+)

inert

inert

Gems & Gemology 2012 Spring, p67

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Spessartine

1.773

1.81

4.14

4.23

Gemmo.eu 

Spessartine

1.78

1.811

4.12

4.25

http://www.gemmology.be 

Spessartine

1.78

1.815

4.12

4.29

http://www.geminterest.com 

Spessartine

1.787

1.811

4.12

4.25

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

Spessartine

1.79

1.81

3.8

4.25

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Spessartine

1.79

1.82

4.12

4.18

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Spessartine

1.79

1.82

3.8

4.25

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

Spessartine

1.79

1.82

4.13

4.33

Gemmological Tables, Ulrich Henn, 2004 

Spessartine

1.79

1.81

4.12

4.2

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Spessartine

1.79

1.81

4.12

4.2

Gems, R Webster, 5th edition 1994 

Spessartine

1.79

1.814

4.12

4.2

Gemology Tools Professional 2010

Spessartine

 

 

3.9

4.2

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Spessartine

orange

Mn²+ in distorted cubic coordination

Gems & Gemology Summer 1988

Spessartine

orange-red

Fe²+ in distorted cubic coordination

Mr. Dominique Flies, La couleur des grenats, l’Université de Nantes, 2008

Spessartine

pink

V³+ in octahedral coordination, Mn²+ in distorted cubic coordination

Mr. Dominique Flies, La couleur des grenats, l’Université de Nantes, 2008

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

albite

Spessartine

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

apatite

Spessartine

www.geminterest.com

barite

Spessartine

Gems & gemology spring 1996 p57

braunite

Spessartine

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, 2010, Jun, p3-18

hematite

Spessartine

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

ilmenite

Spessartine

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

parvowinchite

Spessartine

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

pyrolusite

Spessartine

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

quartz

Spessartine

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

senaite

Spessartine

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

tremolite

Spessartine

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

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Spessartine

 

Darra-i-Pech (Darra-i-Pech) Pegmatite Field

Nangarhar (Ningarhar) Province

Afghanistan

Gems & Gemology Fall 2010, p210

Spessartine

Navegador Mine

Conselheiro Pena

Minas Gerais

Brazil

Gems & Gemology Fall 2010, p 210

Spessartine

Lavrado Escondido

Golconda

Minas Gerais

Brazil

Le Règne minéral 19/1998

Spessartine

Poaia pegmatite, Sao José da Safira, Governador Valadares

Rio Doce

Minas Gerais

Brazil

Gems & Gemology Fall 2010, p 210

Spessartine

Pedra Bonita mine

 

Rio Grande do Norte

Brazil

Mineralogical Record 3/2002

Spessartine

Alto Mirador pegmatite , Ermo, Carnauba dos Dantas

Serido Oriental

Rio Grande do Norte

Brazil

Gems & Gemology Fall 2010, p210

Spessartine

 

Kamtonga

Coast Province

Kenya

Gems & Gemology Fall 2010, p209

Spessartine

Ilakaka Commune, Ranohira District

Horombe Region

Fianarantsoa Province

Madagascar

Gems & Gemology Fall 2010, p210

Spessartine

 

 

Mahajanga (Majunga) Province

Madagascar

Gemmologie, Dez 1999,p 196

Spessartine

 

Ambohimaranitra

Mahajanga (Majunga) Province

Madagascar

Gems & Gemology Fall 2010, p210

Spessartine

 

Ambohimaranitra

Mahajanga (Majunga) Province

Madagascar

Gems & Gemology Fall 2010, p210

Spessartine

 

Antaratra

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p210

Spessartine

 

Sakoandroa

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p210

Spessartine

Sakhangyi

Mogok

Mandalay

Myanmar

Gems & Gemology Fall 2010, p210

Spessartine

 

Marienfluss

Kunene Region

Namibia

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1994, Jun, p39-47

Spessartine

 

 

 

Nigeria

Gemmologie, 1997, Mar,p31

Spessartine

 

Iseyin

Oyo State

Nigeria

Gems & Gemology Fall 2010, p210

Spessartine

 

Komu

Oyo State

Nigeria

Gems & Gemology Fall 2010, p210

Spessartine

 

Ogbomosho (Ogbomoso)

Oyo State

Nigeria

Gems & Gemology Fall 2010, p210

Spessartine

 

Azad Kashmir

 

Pakistan

Gems & Gemology 1996 Fall, p 218-219

Spessartine

Donga Nur

Muzaffarabad district

Azad Kashmir

Pakistan

Gems & Gemology Fall 2010, p210

Spessartine

 

Loliondo

Arusha Region

Tanzania

Gems & Gemology 2008 spring p 76-78

Spessartine

 

 

Iringa Region

Tanzania

Gems & Gemology Fall 2010, p210

Spessartine

 

Nantamba

Lindi Region

Tanzania

Gems & Gemology Fall 2010, p210

Spessartine

 

Tunduru-Songea area

Ruvuma Region

Tanzania

Gemmologie, 1997, Mar,p31

Spessartine

 

Kalalani

Tanga Region

Tanzania

Gems & Gemology Fall 2010, p210

Spessartine

Umba Valley

Lelatema Mts

Tanga Region

Tanzania

Gems & Gemology Fall 2010, p210

Spessartine

Little Three mine, Ramona

San Diego County

California

USA

Mineralogical Record 5/2002

Spessartine

Little Three mine, Ramona

San Diego County

California

USA

Mineralogical Record 5/2002

Spessartine

Ramona

San Diego County

California

USA

Gems & Gemology 2001 summer p278-294

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

Spessartine

orange-yellow

Minas Gerais

Brazil

Gems & Gemology 2001 Winter, p290

36.36

20.78

39.09

 

3.04

 

0.57

 

 

 

Spessartine

light orange-yellow

Rio Grande do Norte

Brazil

Gems & Gemology 2001 Winter, p290

36.14

20.5

38.11

0.96

2.93

0.08

0.39

 

 

 

Spessartine

brown

Qibeiling, Altay Mts

China

Gems & Gemology 1993 winter, p276

37.01

19.42

29.6

0.17

11.03

0.14

0.31

 

 

2.15

Spessartine

orange-yellow

Sahatany Valley

Madagascar

Gems & Gemology 2001 Winter, p290

36.35

20.86

35.89

 

3.39

 

2.85

 

 

 

Spessartine

orange-yellow

Sahatany Valley

Madagascar

Gems & Gemology 2001 Winter, p290

36.52

20.78

35.81

 

4.23

 

1.81

 

 

 

Spessartine

orange

 

Namibia

The Journal of Gemmology 2007,30,5/6,307-319

36.3

20.64

37.28

0.01

5.23

0.13

0.33

0.02

 

0.19

Spessartine

orange

 

Namibia

Gems & Gemology 2001 Winter, p290

35.31

19.61

40.11

2.95

0.99

0.06

0.49

 

 

 

Spessartine

 

Marienfluss, Kunene

Namibia

Zeitschrift der deutschen gemmologischen Gesellschaft, 1994, Jun, p42

33.93

18.87

42.45

2.87

1.08

0.11

0.58

 

 

 

Spessartine

 

Marienfluss, Kunene

Namibia

Zeitschrift der deutschen gemmologischen Gesellschaft, 1994, Jun, p42

34

19.17

42.6

2.71

0.93

 

0.5

 

 

 

Spessartine

 

Marienfluss, Kunene

Namibia

Zeitschrift der deutschen gemmologischen Gesellschaft, 1994, Jun, p42

36.7

20.35

37.63

3.2

0.89

 

0.41

 

 

 

Spessartine

orange-yellow

 

Nigeria

Gems & Gemology 2001 Winter, p290

36.1

21.4

40.6

0.94

0.64

 

0.27

 

 

 

Spessartine

orange

 

Nigeria

The Journal of Gemmology 2000, Vol27, N°3,p130

36.68

21.21

40.38

0.67

0.62

0.07

0.27

 

0.07

 

Spessartine

orange

 

Nigeria

The Journal of Gemmology 2000, Vol27, N°3,p130

37.04

21.4

37.67

0.99

2.77

0.01

0.09

 

0.03

 

Spessartine

orange

 

Nigeria

The Journal of Gemmology 2000, Vol27, N°3,p130

36.55

21.36

39.36

0.96

1.44

0.08

0.19

 

0.05

 

Spessartine

orange

 

Nigeria

The Journal of Gemmology 2000, Vol27, N°3,p130

37.02

21.48

37.76

0.85

2.44

0.09

0.35

 

0.02

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

36.29

21.18

40.52

0.91

0.79

 

0.31

 

 

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

36.14

21.38

40.64

0.94

0.64

 

0.27

 

 

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

36.11

20.82

36.8

0.83

4.85

 

0.58

 

 

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

35.92

20.92

36.82

0.85

4.87

 

0.62

 

 

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

37.09

21.49

37.57

0.87

2.85

 

0.14

 

 

 

Spessartine

 

 

Nigeria

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1999, Dez p224

37.06

21.52

37.5

0.86

2.88

 

0.18

 

 

 

Spessartine

orange-red

 

Pakistan

Gems & Gemology 2001 Winter, p290

36.39

20.6

36.98

 

4.45

 

1.58

 

 

 

Spessartine

 

 

Pakistan

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2010, Jun, p6

35.9

20.3

35.13

 

5.67

0.04

1.58

 

0.004

 

Spessartine

 

 

Tanzania

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2010, Jun, p6

37.41

21.14

34.81

4.73

 

0.07

1.57

 

0.01

 

Spessartine

light orange

Ramona, California

USA

Gems & Gemology 2001 Winter, p290

36.3

20.56

40.67

 

2.06

0.07

0.18

 

 

 

Spessartine

medium light orange

Ramona, California

USA

Gems & Gemology 2001 Winter, p290

36.58

20.38

40.02

 

2.89

0.06

0.07

 

 

 

Spessartine

medium light orange

Ramona, California

USA

Gems & Gemology 2001 Winter, p290

36.71

20.28

38.33

 

3.62

0.07

0.06

 

 

 

Spessartine

medium yellow

Ramona, California

USA

Gems & Gemology 2001 Winter, p290

36.72

20.49

37.16

 

4.64

0.04

0.06

 

 

 

Spessartine

orange-yellow

 

Zambia

Gems & Gemology 2001 Winter, p290

36.51

20.79

40.86

 

1.53

 

0.22