|
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 |
Fe˛+ 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 |
|
|
|