|
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 |
1.743 |
1.743 |
3.77 |
3.77 |
dark red purple |
Elahera, Sri Lanka |
19.12ct |
broad absorption below 430nm, lines at 460, 500, 525, 575nm |
inert |
inert |
GIA Gem Database 34769 |
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 |
Pyrope-almandine |
1.749 |
1.749 |
3.82 |
3.82 |
dark orangy red |
Madagascar |
12.12ct |
band at 500-510, lines at 465, 530, 575nm |
inert |
inert |
GIA Gem Database 34395 |
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 |
1.75 |
1.75 |
3.84 |
3.84 |
purplish red |
Kangala, Tanzania |
1.92ct |
broad absorption below 430nm, lines at 500, 525, 575nm |
inert |
inert |
GIA Gem Database 33459 |
rhodolite - Pyrope-almandine |
1.75 |
1.75 |
3.79 |
3.79 |
purplish red |
Matale District, Sri Lanka |
18.88ct |
broad absorption below 430nm, lines at 495, 520, 570nm |
inert |
inert |
GIA Gem Database 33199 |
rhodolite - Pyrope-almandine |
1.752 |
1.752 |
3.83 |
3.83 |
|
|
2.42ct , composition: Prp63Alm22Sps15 |
|
|
|
Gems & Gemology 2011 Winter, p274 |
rhodolite - Pyrope-almandine |
1.752 |
1.752 |
3.83 |
3.83 |
dark purplish red |
Umba Valley, Tanzania |
14.38ct |
broad absorption below 430nm, lines at 460, 500, 525, 575nm |
inert |
inert |
GIA Gem Database 35021 |
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 |
1.76 |
1.76 |
3.88 |
3.88 |
very dark orangy red |
Mogok, Myanmar |
10.24ct |
band at 495-515, 530-535, 570-575, line at 465nm |
inert |
inert |
GIA Gem Database 34542 |
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 |
1.762 |
1.762 |
3.86 |
3.86 |
dark orangy red |
North Carolina, USA |
14.55ct |
broad absorption below 435nm, band at 500-510, 525-535, 570-585nm, line
at 462nm |
inert |
inert |
GIA Gem Database 35213 |
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 |
1.78 |
1.78 |
0.03 |
4.03 |
dark red |
Congo |
2.14ct, composition: 45.5%Alm-29%Pyr-14.4%Spes-10.1%Gros |
|
|
|
The Journal of Gemmology 2019 Vol 36, N°5, p408 |
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 |
|
|