|
INVESTIGATIONS
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
Malaya garnet -
Pyrope-Spessartine |
1,739 |
1,782 |
3,77 |
4,04 |
light pink, pink, orange |
Bekily, Madagascar |
|
bands 503, 610, 687
(FeČ+) and at 483 (MnČ+) |
|
|
Gems & Gemology 2001
winter p296-308 |
colour change
pyrope-spessartine |
1,74 |
1,773 |
3,75 |
3,99 |
purple, red, orange and
yellow |
|
|
|
|
|
Gems & Gemology 1984
Winter, p200-207 |
colour change
pyrope-spessartine |
1,743 |
1,743 |
3,76 |
3,76 |
deep purple in daylight,
purplish red in incandescent light |
Tanga, Tanzania |
1.07ct |
absorption band at
550-590nm |
inert |
inert |
The Journal of Gemmology
2020 Vol 37 (2), p133 |
Pyrope-spessartine |
1,746 |
1,746 |
3,79 |
3,79 |
purplish red |
Madagascar |
44.28ct |
broad absorption below
430nm; lines at 460, 505, 525, 575nm |
inert |
inert |
GIA Gem Database 34387 |
colour change
pyrope-spessartine |
1,747 |
1,747 |
3,77 |
3,77 |
deep purple in daylight,
purplish red in incandescent light |
Tanga, Tanzania |
1.09ct |
absorption band at
550-590nm |
inert |
inert |
The Journal of Gemmology
2020 Vol 37 (2), p133 |
Pyrope-spessartine |
1,75 |
1,755 |
3,77 |
3,83 |
light reddish orange |
Lindi Province, Tanzania |
|
|
inert |
inert |
Gems & Gemology 2012
Summer, p144-145 |
colour change pyrope-spessartine |
1,75 |
1,75 |
3,84 |
3,84 |
greenish brown, colour
change to reddish |
Tanzania |
0.99ct |
Cr line |
weak red |
inert |
ACAM lab 2247 |
colour change
pyrope-spessartine |
1,751 |
1,798 |
3,78 |
4,1 |
colour changing from
greenish-grey to reddish-violet |
Tunduru-Songea region,
Tanzania |
|
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1997 Mar, p38-39 |
colour change
pyrope-spessartine |
1,751 |
1,751 |
3,85 |
3,85 |
|
|
1.88ct, composition:
Prp63Sps20Alm17 |
|
|
|
Gems & Gemology 2011
Winter, p274 |
Pyrope-spessartine |
1,751 |
1,751 |
3,82 |
3,82 |
pink with faint brown
tint (daylight) - reddish pink (incandescent lighting) |
|
3.22ct, anomalous
extinction |
|
inert |
inert |
The Journal of Gemmology
2016 Vol 35, No. 1, p 10-11 |
Pyrope-spessartine |
1,753 |
1,753 |
3,85 |
3,85 |
greyish with a tinge of
green colour-changing to pale violet |
Sri Lanka |
2.54 ct |
575nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2000 Mar, p2 |
Malaya garnet - Pyrope-Spessartine |
1,755 |
1,755 |
3,862 |
3,862 |
|
|
6.93 ct, Chelsea :
reddish pink |
|
inert |
inert |
http://www.geminterest.com
2008 |
Pyrope-spessartine |
1,756 |
1,756 |
3,85 |
3,85 |
pink |
Lindi Province, Tanzania |
2.29ct |
|
inert |
inert |
Gems & Gemology 2006
Spring, p66-67 |
Pyrope-spessartine |
1,757 |
1,757 |
3,86 |
3,86 |
orange |
Umba Valley, Tanga
Region, Tanzania |
13.80ct |
broad absorption below
430nm; lines at 460, 480, 500, 525nm |
inert |
inert |
GIA Gem Database 35068 |
colour change pyrope-spessartine |
1,758 |
1,758 |
3,64 |
3,64 |
blue, colour change to
purplish pink |
Kamtonga, Taita Taveta,
Kenya |
1,59ct |
|
|
|
The Journal of Gemmology
2023 38 (6), p545-551 |
colour change
pyrope-spessartine |
1,759 |
1,772 |
3,82 |
3,88 |
|
Sri Lanka |
|
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1997 Mar, p5-6 |
colour change
pyrope-spessartine |
1,759 |
1,759 |
3,86 |
3,86 |
dark reddish purple in
daylight, purplish red in incandescent light |
Tanga, Tanzania |
2.02ct |
absorption band at
540-610nm |
inert |
inert |
The Journal of Gemmology
2020 Vol 37 (2), p133 |
colour change
pyrope-spessartine |
1,76 |
1,768 |
3,76 |
3,89 |
blue-green to red violet |
Nigeria |
0.39 to 0.53 ct |
410, 422, 485, 576, 687nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2003 Mar, p3-4 |
colour change
pyrope-spessartine |
1,76 |
1,76 |
3,88 |
3,88 |
Dark greyish greenish
blue (day light) to dark greyish violet |
Sri Lanka |
0.99 ct, chelsea :
orange, weak anomalous double refraction |
400-450 nm cutoff, weak
absorption at 450-470 nm, diffuse bands at 480-490nm, 504 and 520 nm, and
560-580 nm |
inert |
inert |
Gems & Gemology 1998
Summer, p139 |
Pyrope-spessartine |
1,76 |
1,76 |
3,89 |
3,9 |
brownish pinkish orange |
Madagascar |
0.95 and 1.60ct, strong anomalous
double refraction |
strong 430 and weak 500
nm bands |
inert |
inert to faint orange |
Gems & Gemology 1998
Fall, p222 |
colour change
pyrope-spessartine |
1,76 |
1,77 |
3,93 |
4 |
colour change:
yellow-green (daylight) to orange (incandescent light) |
|
|
absorption lines in the
blue and violet section, and very weak absorption bands at 520 and 573nm |
|
|
Gems & Gemology 2017
Spring, p137-138 |
Pyrope-spessartine |
1,762 |
1,762 |
3,89 |
3,89 |
colour change: greenish
blue to purplish red or red |
Nandagala, Tanzania |
|
band at 400nm, broad
absorption at 570nm |
|
|
Gems & Gemology 2011
Fall, p240-241 |
colour change
pyrope-spessartine |
1,762 |
1,765 |
3,88 |
3,91 |
blue-green to purple |
Kamtonga, Taita Hills,
Kenya |
|
575, 505 en cut-off
485nm; Vis-NIR: transmission 475nm, 650nm, absorption 486, 505, 577 |
inert |
inert |
Gems & Gemology 2009
Fall, p223-224 |
Malaya garnet -
Pyrope-Spessartine |
1,762 |
1,762 |
3,9 |
3,9 |
|
|
1.53ct, composition::
Prp47Sps46Alm7 |
|
|
|
Gems & Gemology 2011
Winter, p274 |
colour change
pyrope-spessartine |
1,763 |
1,77 |
|
|
colour change induced by
V2O3 |
East Africa |
|
|
|
|
Gems & Gemology 1988
fall p 176-177 |
Pyrope-spessartine |
1,765 |
1,765 |
3,9 |
3,9 |
colour change:
bluish-green to reddish violet |
Toliara Province Madagascar |
5.08ct |
band 576 |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2005 Sep, p66 |
Malaya garnet -
Pyrope-Spessartine |
1,765 |
1,765 |
3,91 |
3,91 |
|
|
2.27ct, composition::
Prp47Sps32Alm21 |
|
|
|
Gems & Gemology 2011
Winter, p274 |
colour change
pyrope-spessartine |
1,765 |
1,766 |
|
|
greenish yellow in
daylight, and intense pink to red in incandescent light |
Madagascar |
2.52, 3.25, and 5.23 ct |
Mn2+ bands at 207, 237,
242, and 245 nm, and two relatively weak Fe2+ bands at 199 and 218nm and
broad V3+/Cr3+ absorption with a maximum at 571 nm |
|
|
Gems & Gemology 1998
Fall, p222-223 |
colour change
pyrope-spessartine |
1,768 |
1,771 |
3,86 |
4,03 |
golden yellow to brownish
red |
Nigeria |
0.74 to 1.98 ct, also
almandine component |
MnČ+ bands |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2003 Mar, p3-4 |
colour change
pyrope-spessartine |
1,77 |
1,77 |
3,94 |
3,94 |
bluish green, colour
change |
Madagascar |
0.79ct |
|
inert |
inert |
ACAM lab 1895 |
colour change
pyrope-spessartine |
1,77 |
1,77 |
3,91 |
3,91 |
Greyish greenish blue
(daylight) to purple |
Sri Lanka |
0.48 and 0.59 ct, chelsea
: orange, weak anomalous double refraction |
435 nm cutoff; 460, 480,
504, and 520 nm lines, and wide band at 573 nm |
inert |
inert |
Gems & Gemology 1998
Summer, p139 |
TABLES
Stone |
RI
min |
RI
max |
Dens
min |
Dens
max |
Reference |
Pyrope-Spessartine |
1.739 |
1.775 |
3.83 |
4.16 |
Gemmo.eu 2013 |
Pyrope-Spessartine |
1.742 |
1.8 |
3.81 |
3.88 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Pyrope-Spessartine |
1.742 |
1.78 |
3.75 |
4 |
http://www.geminterest.com |
Malaya garnet - Pyrope-Spessartine |
1.742 |
1.78 |
3.78 |
3.85 |
Gemology Tools Professional 2010 |
Pyrope-Spessartine |
1.75 |
1.78 |
3.8 |
4.11 |
http://www.gemmology.be |
Pyrope-Spessartine |
1.75 |
1.78 |
3.8 |
4.11 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Malaya garnet - Pyrope-Spessartine |
1.751 |
1.788 |
3.82 |
4.05 |
Gemmological Tables, Ulrich Henn,
2004 |
colour change Pyrope-spessartine |
1.753 |
1.772 |
3.8 |
4.18 |
Gemmological Tables, Ulrich Henn,
2004 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Pyrope-spessartine |
colour change |
Vł+ and/or Crł+
in octahedral coordination |
Gems & Gemology Summer 1988 |
colour change Pyrope-spessartine |
greyish greenish blue |
probably
combination of MnČ+ and Vł+ absorptions are responsible for colour change |
Gems&Gemology 1998, summer, p138 |
MINERAL
INCLUSIONS
Inclusion |
Stone |
Reference |
apatite |
colour change Pyrope-spessartine |
Gemmological
Tables, Ulrich Henn , GGA, 2004 |
apatite |
Pyrope-spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
graphite |
Pyrope-spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
quartz |
Malaya garnet - Pyrope-spessartine |
http://www.gemlab.net |
rutile |
colour change Pyrope-spessartine |
Gemmological
Tables, Ulrich Henn , GGA, 2004 |
rutile |
Malaya garnet - Pyrope-spessartine |
http://www.gemlab.net |
rutile |
Pyrope-spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
zircon |
Pyrope-spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
Pyrope-spessartine |
Bekily Department |
Southwestern Region |
Tuléar (Toliara) Province |
Madagascar |
Gems & Gemology 2001 winter p296 |
Pyrope-spessartine |
Umba Valley |
Lelatema Mts |
Arusha Region |
Tanzania |
Gemmologie, 1997, Mar,p31 |
Pyrope-spessartine |
|
Tunduru-Songea area |
Ruvuma Region |
Tanzania |
Gemmologie, 1997, Mar,p31 |
CHEMICAL DATA
(%)
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Cr2O3 |
V2O3 |
Fe2O3 |
K2O |
CuO |
NiO |
|
colour change Pyrope-spessartine |
different colours |
|
|
Gems & Gemology 1984 Winter p202 |
40.07 |
22.44 |
17.22 |
12.75 |
4.4 |
0.12 |
5.32 |
|
0.33 |
0.39 |
|
|
|
|
colour change Pyrope-spessartine |
yellow-green to red-brown |
|
|
Gems & Gemology 1985 summer p117 |
39.5 |
21.7 |
22.9 |
7.3 |
1.8 |
0.3 |
6.9 |
|
0 |
0.3 |
|
|
|
|
colour change Pyrope-spessartine |
brown to reddish
brown (80% spessartine) |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
37.65 |
20.06 |
34.41 |
0.87 |
3.1 |
0.51 |
3.11 |
|
0.26 |
0.44 |
|
|
|
|
colour change Pyrope-spessartine |
blue to blue
with purplish hue, slight hue change |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
38.63 |
21.12 |
18.49 |
10.45 |
0.65 |
0.06 |
7.31 |
|
0.38 |
1.61 |
|
|
|
|
colour change Pyrope-spessartine |
blue-greenish to
purplish-blue |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
38.81 |
20.48 |
21.31 |
11.78 |
2.84 |
0.03 |
3.01 |
|
0.95 |
0.91 |
|
|
|
|
colour change Pyrope-spessartine |
blue-greenish to
purplish-blue |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
41.47 |
22.7 |
14.75 |
15.25 |
0.96 |
0.04 |
4.65 |
|
0.17 |
0.43 |
|
|
|
|
colour change Pyrope-spessartine |
yellowish-green
to pink-light purple |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
40.22 |
21.67 |
18.89 |
10.49 |
2.29 |
0.11 |
5.09 |
|
0.11 |
0.27 |
|
|
|
|
colour change Pyrope-spessartine |
brownish-green
to brownish-red (77% spessartine) |
|
Madagascar |
The Journal of
Gemmology 2001, 27,7,p400 |
37.22 |
19.99 |
33.69 |
4.21 |
0.52 |
0.25 |
1.73 |
|
0.24 |
1.3 |
|
|
|
|
colour change Pyrope-spessartine |
blue-green to
purple red |
|
Tanzania |
Gems & Gemology 1970 summer p174-177 |
38.35 |
26.45 |
16.73 |
13.1 |
1.45 |
0.1418 |
2.38 |
|
0.54 |
0.324 |
|
|
0.0019 |
0.0041 |
colour change Pyrope-spessartine |
green |
|
Tanzania |
The Journal of Gemmology 2007,30,5/6,307-319 |
39.23 |
21.67 |
24.18 |
8.71 |
0.51 |
0.08 |
3.56 |
0.03 |
0.36 |
1.22 |
|
0.02 |
|
|
Malaya garnet - Pyrope-Spessartine |
yellowish-orange |
|
Tanzania |
The Journal of Gemmology
2007,30,5/6,307-319 |
40.73 |
23.23 |
15.99 |
14.23 |
3.53 |
0.03 |
2.34 |
0.02 |
0.01 |
0.01 |
0.06 |
0.01 |
|
|
Pyrope-spessartine |
red |
|
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.3 |
23.1 |
3.39 |
16.18 |
14.41 |
0.05 |
1.68 |
|
0.11 |
0.13 |
|
|
|
|
Pyrope-spessartine |
red |
|
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.2 |
23.28 |
1.29 |
15.18 |
19.24 |
0.05 |
1.56 |
|
0.04 |
0.05 |
|
|
|
|
Pyrope-spessartine |
purplish pink |
|
Madagascar |
Gems & Gemology 2001 Winter, p300 |
42.3 |
24.14 |
0.2 |
18.27 |
16.79 |
0.01 |
1.02 |
|
0.03 |
0.01 |
|
|
|
|
Pyrope-spessartine |
intens pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
39.93 |
23.01 |
12.82 |
14.69 |
6.99 |
0.04 |
2.03 |
|
0.16 |
0.16 |
|
|
|
|
Pyrope-spessartine |
light pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
41.24 |
23.94 |
12.44 |
19.07 |
2 |
0.01 |
1.26 |
|
0.05 |
0.08 |
|
|
|
|
Pyrope-spessartine |
light pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.96 |
23.59 |
14.81 |
16.94 |
2.13 |
0.01 |
1.81 |
|
0.09 |
0.11 |
|
|
|
|
Pyrope-spessartine |
light pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
41.44 |
23.32 |
6.25 |
19.41 |
6.11 |
0.04 |
2.05 |
|
0.08 |
0.09 |
|
|
|
|
Pyrope-spessartine |
orange |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
38.68 |
22.1 |
26.63 |
6.17 |
5.65 |
0.09 |
1.77 |
|
0.07 |
0.08 |
|
|
|
|
Pyrope-spessartine |
orange-red |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
39.99 |
23.31 |
9.18 |
15.62 |
9.65 |
0.06 |
1.6 |
|
0.12 |
0.17 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
39.41 |
22.88 |
10.09 |
14.03 |
12.11 |
0.02 |
1.07 |
|
0.05 |
0.04 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
41.91 |
23.84 |
13.04 |
16.65 |
4.45 |
0.05 |
1.81 |
|
0.07 |
0.08 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.69 |
23.14 |
13.5 |
16.46 |
3.6 |
0.05 |
1.7 |
|
0.06 |
0.05 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
39.94 |
22.85 |
13.53 |
15.96 |
4.11 |
0.04 |
1.68 |
|
0.1 |
0.07 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
41.33 |
23.61 |
12.7 |
15.81 |
5.75 |
0.06 |
1.98 |
|
0.09 |
0.09 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
41.29 |
23.83 |
11.57 |
14.93 |
9.73 |
0.04 |
1.05 |
|
0.05 |
0.03 |
|
|
|
|
Pyrope-spessartine |
pink |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.34 |
23.34 |
10.42 |
15.31 |
10.07 |
0.03 |
1.07 |
|
0.05 |
0.05 |
|
|
|
|
Pyrope-spessartine |
pinkish orange |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.97 |
23.27 |
16.72 |
14.89 |
3.61 |
0.06 |
1.23 |
|
0.04 |
0.04 |
|
|
|
|
Pyrope-spessartine |
red |
Bekily |
Madagascar |
Gems & Gemology 2001 Winter, p300 |
40.86 |
23 |
7.83 |
15.07 |
11.75 |
0.05 |
1.9 |
|
0.19 |
0.08 |
|
|
|
|
pyrope-spessartine-grossularite |
yellowish-brown |
|
Tanzania |
The Journal of
Gemmology 1982, Vol 18, N°3, p196 |
39.56 |
22.03 |
19.94 |
7.41 |
1.53 |
0.24 |
8.88 |
|
|
0.18 |
|
|
|
|