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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Almandine

1.791

1.791

4.13

4.13

 

 

3.06ct, composition: Alm64Prp32Sps4

 

 

 

Gems & Gemology 2011 Winter, p274

Almandine

1.792

1.798

4.08

4.11

 

Sao Valéria, Tocantins, Brazil

66%almandine, 25.8% pyrope, 1.9% grossular, 6.3% spessartine

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p147-152

Almandine

1.793

1.793

4.1

4.1

 

 

0.52ct, composition: Alm62Grs35Prp3

 

 

 

Gems & Gemology 2011 Winter, p274

Almandine

1.795

1.801

4.086

4.128

purplish red, colour-change (red in incandescent light)

Fazenda Rodolita, Tocantins State, Brazil

Al65.9Py21.5Sp10.1Gr2.3

 

 

 

The Australian Gemmologist 2015 Vol 25, No.10 p336-345

Almandine

1.798

1.798

3.93

3.93

dark redish brown

Umba, Tanzania

6.45ct

almandine

inert

inert

ACAM lab  2178

Almandine

1.798

1.798

4.06

4.06

dark reddish brown

Nijar, Almeria, Spain

1.84ct

 

inert

inert

ACAM lab  3847

Almandine

1.799

1.8

4.14

4.15

 

Luc Yen, Vietnam

 

strong bands at 504, 520, 573, weak bands at 423, 460 and 610nm

 

 

Gems & Gemology 1993 winter, p285

Almandine

1.8

1.8

4.16

4.16

dark red

Nijar, Almeria, Spain

1.5ct

 

inert

inert

ACAM lab  3848

Almandine

1.808

1.808

4.07

4.16

 

Emerald Creek, Idaho, USA

 

 

 

 

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

Almandine

 

 

4.13

4.13

 

Malawi

RI > 1.81; 72% almandine, 16% spessartine, 8% pyrope, 4% grossular

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1992 Apr, p17-19

Almandine

 

 

4.13

4.17

very dark red with brownish tint

Negev, Israel

cabochons up to 1.54ct, highly included

 

 

 

The Journal of Gemmology 2016 35 (3), p184

Almandine

 

 

4.24

4.24

 

Erving, Massachusetts, USA

28 stones (0.20 to 4.74ct), RI over the limit

 

 

 

The Journal of Gemmology 2014 Vol 34, N°4, p 286-287

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Almandine

1.75

1.83

3.95

4.3

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Almandine

1.76

1.83

3.83

4.3

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

Almandine

1.76

1.81

3.88

4.2

John Sinkakas, Gemstone and mineral data book,1972 

Almandine

1.77

1.82

3.93

4.17

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Almandine

1.77

1.83

3.92

4.2

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Almandine

1.78

1.81

3.95

4.2

Gemmological Tables, Ulrich Henn, 2004 

Almandine

1.78

1.81

3.95

4.2

Gems, R Webster, 5th edition 1994 

Almandine

1.785

1.83

3.95

4.3

http://www.gemmology.be 

Almandine

1.785

1.83

3.95

4.3

http://www.geminterest.com 

Almandine

1.785

1.83

3.95

4.3

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

Almandine

1.794

1.831

3.94

4.32

Gemmo.eu 

 

CAUSE OF COLOUR

Stone

colour

cause of colour

Reference

Almandine

red

Fe²+ in distorted cubic coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

apatite

Almandine

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

augite

Almandine

Joel Arem, Color Encyclopedia of Gemstones, 1987

biotite

Almandine

Joel Arem, Color Encyclopedia of Gemstones, 1987

graphite

Almandine

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

hornblende

Almandine

Joel Arem, Color Encyclopedia of Gemstones, 1987

ilmenite

Almandine

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

monazite

Almandine

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

phlogopite

Almandine

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

pyrite

Almandine

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

pyrrhotite

Almandine

Extra Lapis English no.11: GARNET (2008)

quartz

Almandine

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

rutile

Almandine

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

sillimanite

Almandine

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

spinel

Almandine

Joel Arem, Color Encyclopedia of Gemstones, 1987

titanite

Almandine

http://www.geminterest.com/

zircon

Almandine

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

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Almandien

Mina Rhodolita, Peixe

Peixe alkaline complex

Tocantins

Brazil

The Australian Gemmologist, 2015, Vol 25, No.10 p336-345

Almandine

B-Q claim

Passmore

British Columbia

Canada

InColor Fall-Winter 2007-2008 p19

Almandine

 

Vakinankaratra Region (Betafo - Antsirabé region)

Antananarivo Province

Madagascar

Gemmologie, Dez 1999,p196

Almandine

Star garnet locality, Ambatondrazaka Department

Alaotra-Mangoro Region

Toamasina (Tamatave) Province

Madagascar

Schmetzer, K., Glas, M. & Bernhardt, H-J. (2002): Sterngranate aus Madagaskar. Lapis 27 (2), 20-27.

Almandine

Erongo Mts

Usakos and Omaruru Districts

Erongo Region

Namibia

Gems & Gemology Fall 2010, p203

Almandine

Red Embers Mine (Two Fat Guys Mine), Erving

Franklin County

Massachusetts

USA

The Journal of Gemmology 2014, Vol 34, N°4, p 286-287

Almandine

 

Luc Yen

 

Vietnam

Gems & Gemology 1993 winter, p285

 

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

Almandine

purplish red

 

 

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

35.42

21.58

0.47

3.68

34.32

0.02

0.76

0.01

0.02

3.52

Almandine

amethyst like

Tocantins

Brazil

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1998, Sep p149

38

19.6

2.6

6

31

<0.02

0.35

 

<0.02

 

Almandine

cat's eye

 

East Africa

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

39.48

21.48

0.75

8.04

21.92

 

8.18

 

 

 

Almandine

purplish red

 

India

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

38.1

20.65

3.47

4.47

33.2

0.01

0.57

0.01

0.03

 

Almandine

 

Rajasthan

India

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1998, Sep p149

38.2

21.7

0.2

6.7

33.5

<0.02

0.35

 

<0.02

 

Almandine

red

 

Malawi

Zeitschrift der deutschen gemmologischen Gesellschaft, 1992, Apr, p19

36.66

21.01

7.05

2.07

31.96

 

1.25