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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Pyrope-almandine

1.741

1.741

3.85

3.85

red

Ethiopia

1.35ct

weak absorption lines at 430, 460, and 620 nm, and strongerbands at 505, 520, and 570 nm

inert

inert

Gems & Gemology 2005 Summer, p177

Pyrope-almandine

1.742

1.742

3.8

3.8

orange-red

Tanzania

1.35 - 6.92 ct

lines at 504, 520, and 573 nm

inert

inert

Gems & Gemology 2007 Summer, p172-173

Pyrope-almandine

1.743

1.743

3.77

3.77

red-purple

Elahera, Central Province, Sri Lanka

19.12ct

broad absorption below 430nm; lines at 460, 500, 525, 575nm

inert

inert

GIA Gem Database  34769

Pyrope-almandine

1.743

1.749

3.82

3.82

moderate purplish red (day light) to slightly orangey red (incandescent light)

East Africa

3.24-3.89ct, Pyr(58.9-62.2%)Alm(24.0-28.5%)Sp(6.9-9.8%)Gr(5.2-5.9%)

 

 

 

The Journal of Gemmology 2016 35 (3), p 190-192

Pyrope-almandine

1.744

1.744

3.78

3.78

 

Elahera, Central Province, Sri Lanka

30.60ct

broad absorption below 430nm; lines at 460, 500, 525, 575nm

inert

inert

GIA Gem Database  34759

Pyrope-almandine

1.744

1.744

3.84

3.84

dark orange-red

Ethiopia

1.31ct

weak absorption lines at 430, 460, and 620 nm, and strongerbands at 505, 520, and 570 nm

inert

inert

Gems & Gemology 2005 Summer, p177

rhodolite - Pyrope-almandine

1.747

1.757

3.77

3.85

purplish red

Malawi

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2015 Dez, p50

rhodolite - Pyrope-almandine

1.748

1.748

3.77

3.77

purplish red

Umba Valley, Tanga Region, Tanzania

4.43ct

broad absorption below 430nm; lines at 500, 525, 575nm

inert

inert

GIA Gem Database  33206

Pyrope-almandine

1.748

1.748

3.73

3.79

dark red

Solomon Islands

0.94 - 1.39 ct

a dark diffuse band from the violet to the blue

inert

inert

Gems & Gemology 2010 spring, p66

Pyrope-almandine

1.748

1.748

3.73

3.73

 

Salima, Malawi

1.47ct

 

 

 

The Journal of Gemmology 2015 Vol 38, No 8, p657

rhodolite - Pyrope-almandine

1.749

1.749

3.8

3.8

purplish red

Umba Valley, Tanga Region, Tanzania

18.53ct

broad absorption below 430nm; lines at 460, 505, 525, 575nm

inert

inert

GIA Gem Database  33198

Pyrope-almandine

1.749

1.749

3.75

3.75

moderate purplish pink

Salima, Malawi

2.14ct

 

 

 

The Journal of Gemmology 2015 Vol 38, No 8, p657

rhodolite - Pyrope-almandine

1.75

1.75

3.8

3.8

dark slightly brownish purplish red

Tanzania

nearly transparent, distinct 4 or 6 rayed star; chelsea: brownish orange

440nm cutoff, 465, 507-510, 521-531, 562-581nm

inert

inert

The Journal of Gemmology 1990 Vol 22,N°1,p16-18

Pyrope-almandine

1.75

1.75

3.84

3.84

purplish red

Eheliyagoda, Sabaragamuwa Province, Sri Lanka

8.14ct

broad absorption below 430nm; lines at 460, 480, 500nm

inert

inert

GIA Gem Database  34841

Pyrope-almandine

1.75

1.75

3.82

3.82

 

 

3.18ct, composition: Prp66Alm30Grs4

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope-almandine

1.75

1.75

3.76

3.76

very dark red

 

38.92ct, cabochon

only a narrow transmission region in the red

inert

inert

Gems & Gemology 1997 winter, p295

rhodolite - Pyrope-almandine

1.75

1.75

3.84

3.84

medium purple-pink

Madagascar

1.28ct

absorption bands at 465, 500, 525, 565 and 610 nm

 

 

Gems & Gemology 1994 Sping, p51

rhodolite - Pyrope-almandine

1.752

1.752

3.83

3.83

 

 

2.42ct , composition: Prp63Alm22Sps15

 

 

 

Gems & Gemology 2011 Winter, p274

rhodolite - Pyrope-almandine

1.756

1.756

3.87

3.87

dark reddish purple

Madagascar

1.36ct

absorption bands at 435, 465, 500, 525, 575 and 610nm

 

 

Gems & Gemology 1994 Sping, p51

Pyrope-almandine

1.757

1.757

4

4

purplish pink

Ethiopia

0.89 ct

weak absorption lines at 430, 460, and 620 nm, and strongerbands at 505, 520, and 570 nm

inert

inert

Gems & Gemology 2005 Summer, p177

Pyrope-almandine

1.758

1.758

3.88

3.88

red-orange

Umba Valley, Tanga Region, Tanzania

11.42ct

broad absorption below 435nm; lines at 460, 480, 505, 525nm

inert

inert

GIA Gem Database  33201

rhodolite - Pyrope-almandine

1.758

1.758

3.85

3.85

red-orange

Kangala, Arusha Region, Tanzania

2.54ct

broad absorption below 430nm; lines at 500, 525, 575nm

inert

inert

GIA Gem Database  33461

Pyrope-almandine

1.758

1.758

3.87

3.87

dark orangy red

Madagascar

0.84 ct

absorption bands at 420,435,465, 500,525, and 575nm

 

 

Gems & Gemology 1994 Sping, p51

Pyrope-almandine

1.76

1.765

3.77

3.81

purply red

Orissa, India

 

 

 

 

The Australian Gemmologist 1987 Feb p197

rhodolite - Pyrope-almandine

1.76

1.77

3.81

3.89

bluish purple

Mozambique

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2015 Dez, p50

Pyrope-almandine

1.762

1.762

3.87

3.87

 

 

2.14ct, composition: Prp52Alm40Grs8

 

 

 

Gems & Gemology 2011 Winter, p274

rhodolite - Pyrope-almandine

1.762

1.762

3.85

3.85

 

 

2.20ct, composition: Prp52Alm36Grs12

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope-almandine

1.763

1.77

3.86

3.9

brownish red

Kalalani, Tanzania

 

 

 

 

Gems & Gemology 1999 summer p116

Pyrope-almandine

1.764

1.77

3.85

3.89

purple

Manica Province, Mozambique

 

 

inert

inert

Gems & Gemology 2016 Fall, p 321-323

Pyrope-almandine

1.764

1.764

3.84

3.84

red

Barton mine, Gore mountain, North Greek, New York, USA

 

 

 

 

The Journal of Gemmology 1975 N°6,p273-280

rhodolite - Pyrope-almandine

1.765

1.773

3.75

3.82

intensive red-violet

Tanzania

 

small bands with maxima at 693, 573, 523, 503, 420 and 364nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1997 Mar, p38-39

Pyrope-almandine

1.765

1.765

3.89

3.89

vivid slightly reddish purple

Tanzania ?

3.87ct

 

 

 

The Journal of Gemmology 2015 Vol 38, No 8, p657

Pyrope-almandine

1.77

1.776

3.89

3.96

 

Mozambique

 

strong bands at 504, 520 and 573nm

inert

inert

Gems & Gemology 1996 summer, p131

Pyrope-almandine

1.784

1.784

4.02

4.02

 

 

3.55ct, composition: Alm57Grs33Prp10

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope-almandine

1.807

1.807

4.15

4.15

 

 

3.39ct, composition: Alm77Grs19Prp4

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope-almandine

 

 

3.95

3.95

red, cat's-eye

Sri Lanka

2.73ct

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Dec, p121

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

rhodolite - Pyrope-almandine

1.66

1.86

3.84

3.84

John Sinkakas, Gemstone and mineral data book,1972 

rhodolite - Pyrope-almandine

1.74

1.77

3.74

3.94

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

rhodolite - Pyrope-almandine

1.74

1.78

3.84

3.84

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

rhodolite - Pyrope-almandine

1.74

1.77

3.74

3.94

Gemology Tools Professional 2010

Pyrope-almandine

1.742

1.784

3.75

4.1

http://www.geminterest.com 

Pyrope-almandine

1.742

1.785

3.75

3.95

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

rhodolite - Pyrope-almandine

1.742

1.784

3.75

4.1

http://www.geminterest.com 

rhodolite - Pyrope-almandine

1.745

1.761

3.79

3.89

Joel Arem, Color Encyclopedia of Gemstones, 1987 

rhodolite - Pyrope-almandine

1.748

1.796

3.76

3.95

Gemmo.eu 2013

Pyrope-almandine

1.75

1.78

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Pyrope-almandine

1.75

1.785

3.8

3.95

http://www.gemmology.be 

Pyrope-almandine

1.75

1.78

3.7

3.95

Gems, R Webster, 5th edition 1994 

rhodolite - Pyrope-almandine

1.75

1.78

3.8

3.95

Gemmological Tables, Ulrich Henn, 2004 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Pyrope-almandine

pink

Fe²+ in distorted cubic coordination

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

Pyrope-almandine

red, purplish red

Fe²+ in distorted cubic coordination and Fe³+

Steffen, Farbe und Lumineszenz von Mineralien, 2000

Pyrope-almandine

reddish purple

Fe²+ in distorted cubic coordination

Gems & Gemology Summer 1988

rhodolite - Pyrope-almandine

reddish purple

Fe²+ in distorted cubic coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

apatite

rhodolite - Pyrope-almandine

Gemmological Tables, Ulrich Henn , GGA, 2004

monazite

rhodolite - Pyrope-almandine

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

pyrite

rhodolite - Pyrope-almandine

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

quartz

rhodolite - Pyrope-almandine

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

rutile

Pyrope-almandine

www.geminterest.com

rutile

rhodolite - Pyrope-almandine

Gemmological Tables, Ulrich Henn , GGA, 2004

titanite

rhodolite - Pyrope-almandine

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

zircon

Pyrope-almandine

www.geminterest.com

zircon

rhodolite - Pyrope-almandine

www.geminterest.com

 

LOCALITIES

rhodolite-Pyrope-almandine

Departementa Ranohira

Horombe region

Fianarantsoa Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

Ihosy, Ihosy Department

Horombe Region

Fianarantsoa Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

Departementa Ampanihy

Atsimo Andrefana region

Tuléar (Toliara ) Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

 

Betroka

Tuléar (Toliara ) Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

Ambovombe-Atsimo Department

Androy Region

Tuléar (Toliara) Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

Betioky Department

Southwestern Region

Tuléar (Toliara) Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

 

Tolanaro

Tuléar (Toliara) Province

Madagascar

Gemmologie, Dez 1999,p196

rhodolite-Pyrope-almandine

Mwaki Jembe mine

 

 

Tanzania

Gems & Gemology 1989 Spring p44

rhodolite-Pyrope-almandine

Kangala mine

 

Northern Tanzania

Tanzania

Gems & Gemology 1989 Spring p44

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

K2O

V2O3

Pyrope-almandine

cat's eye

 

East Africa

The Journal of Gemmology 1995, Vol 24, N°8, p 574

41.31

24.17

0.54

17.36

10.29

 

6.41

 

 

 

 

 

Pyrope-almandine

purplish red

 

East Africa

The Journal of Gemmology 2016, Vol 35,No3, p194

41.01

23.01

4.09

16.59

12.76

0.14

2.08

 

0.17

 

 

0.19

rhodolite - Pyrope-almandine

purplish red

 

Malawi

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2015, Dez, p 51

40.41

22.04

2.48

16.14

17.49

 

1.97

 

0.01

 

 

 

rhodolite - Pyrope-almandine

reddish purple

 

Mozambique

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 2015, Dez, p 51

38.02

21.94

0.25

12.84

24.89

 

1.13

 

 

 

 

 

Pyrope-almandine

purple

 

Mozambique

Gems & Gemology 2016 Fall p 323

42.34

25.41

0.22

13.16

17.93

 

0.94

 

 

 

 

0.002

Pyrope-almandine

purple

Catandica

Mozambique

The Journal of Gemmology 2015, Vol 8, No34, p658

40.23

23.01

0.21

12.72

24.03

 

0.77

 

 

 

 

 

Pyrope-almandine

red

 

Somaliland

The Journal of Gemmology 2000, Vol27, N°3,p148

40.19

22.56

0.54

12.68

20.07

0.03

3.8

 

0.04

0.32

 

 

Pyrope-almandine

red-purple

 

Sri Lanka

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

40.61

21.56

0.33

10.53

2.736

0.01

0.47

0.02

0.01

 

0.01

 

rhodolite - Pyrope-almandine

red-purple

 

Sri Lanka

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

39.47

21.63

1.04

10.83

24.36

0.04

1.86

0.01

0.04

0.18

0.03

 

rhodolite - Pyrope-almandine

red-purple

 

Sri Lanka

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

40.68

23.05

3.09

18.11

11.23

0.02

1.52

0.01

0.05

1.86

0.01

 

rhodolite - Pyrope-almandine

 

Peter A. claim , Kalalani

Tanzania

Gems & Gemology 1999 Summer

38.12

22.73

0.64

 

23.9

 

 

 

 

 

 

 

rhodolite - Pyrope-almandine

 

Peter A. claim , Kalalani

Tanzania

Gems & Gemology 1999 Summer

39.23

22.2

0.8

 

21.66

0.06

 

 

 

 

 

 

rhodolite - Pyrope-almandine

 

Peter A. claim , Kalalani

Tanzania

Gems & Gemology 1999 Summer

36.63

25.53

0.81

 

19.05

 

 

 

 

 

 

 

Pyrope-almandine

purple

Tanga

Tanzania

The Journal of Gemmology 2015, Vol 8, No34, p658

40.4

22.95

0.25

13.36

22.17

 

1.35

 

 

 

 

 

Pyrope-almandine

violet

Tunduru-Songea region

Tanzania

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1997, Mar, p40

41.56

23.77

0.3

19.4

14.01

 

0.88

 

 

0.21