|
INVESTIGATIONS
|
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
|
Spessartine |
1,777 |
1,785 |
4,02 |
4,08 |
orange |
Loliondo,Tanzania |
76.1% spessartine, 19.3%
pyrope, 4.3% grossular |
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2010 Jun, p3-18 |
|
Spessartine |
1,78 |
1,78 |
4,04 |
4,04 |
|
Loliondo, Tanzania |
between pyrop-spessartine and spessartine |
bands at 460, 480 and
520, cutoff at 435 |
inert |
inert |
Gems & Gemology 2008
spring p 76-78 |
|
Spessartine |
1,789 |
1,79 |
4,12 |
4,14 |
|
Kunene, Namibia |
|
dominant lines at about
412, 424, 432 (edge), 462, and 485 nm as well as a line at 495 nrn |
|
|
Gems & Gemology 1996
Spring, p56-57 |
|
Spessartine |
1,79 |
1,796 |
4,04 |
4,15 |
|
Kunene, Namibia |
84% spessartine, 12.6%
pyrope, 1.9% almandine, 1.3% grossular; "hollandine" |
Mn²+ |
|
|
Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1993 Sep, p64 |
|
Spessartine |
1,79 |
1,797 |
4,09 |
4,15 |
orange |
Marienfluss, Kunene
Region, Namibia |
spessartine component :
84-86%, discovered in 1992 |
|
|
|
Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1994 Jun, p39-47 |
|
Spessartine |
1,79 |
1,79 |
4,12 |
4,12 |
red |
Congo |
3.48ct, composition:
49.1%Sp-31%Alm-11%gro-8.4%pyr |
|
|
|
The Journal of Gemmology
2019 Vol 36, N°5, p408 |
|
Spessartine |
1,791 |
1,791 |
4,1 |
4,1 |
orange |
Namibia |
3.93ct,
"Hollandine" |
cutoffa t about 445 nm, a |
|
|
Gems & Gemology 1993
Spring, p61 |
|
Spessartine |
1,799 |
1,808 |
4,19 |
4,26 |
|
Ramona, San Diego County,
California, USA |
|
cutoff 435-440, bands
460, 480-485, 520-525; 504line |
|
|
Gems & Gemology 2001
summer p278-294 |
|
Spessartine |
1,799 |
1,8 |
4,2 |
4,25 |
orange |
Lundazi area, Zambia |
2.09 - 11.03 ct |
cutoff at 435 nm; bands
at 460, 480, and 530 nm; and a weak 504 nm line |
inert |
inert |
Gems & Gemology 1999
Winter, p217 |
|
Spessartine |
1,8 |
1,81 |
4,1 |
4,25 |
bicoloured orange and
orangy brown |
Galilea pegmatite region
near Governador Valadares, Brazil |
up to 5.61ct |
|
|
|
Gems & Gemology 2002
Fall, p269-270 |
|
Spessartine |
1,8 |
1,808 |
4,15 |
4,22 |
bright yellowish-orange,
orange to orange-brown, red |
Madagascar |
|
|
|
|
The Journal of Gemmology
2002 Vol28, N°4-236 |
|
Spessartine |
1,8 |
1,8 |
4,19 |
4,2 |
slightly yellowish orange
to brownish orange |
Azad Kashmir, Pakistan |
transparent,
"Kashmirine garnets" |
bands 410,420 and 430nm |
inert |
inert |
Gems & Gemology 1996
Fall, p 218-219 |
|
Spessartine |
1,801 |
1,801 |
4,14 |
4,14 |
orangey red |
Congo |
1.10ct, composition:
75.2%Spes9.3%Alm-7.8%Gros-6.5%Pyr |
|
|
|
The Journal of Gemmology
2019 Vol 36, N°5, p408 |
|
Spessartine |
1,801 |
1,803 |
4,15 |
4,22 |
yellow, yellow-orange,
brown-orange |
Nigeria |
tabby extinction under
crossed polarizing filters, variation of almandine component 1% to 6% is
responsible for the variation of colour |
|
|
|
The Journal of Gemmology
2000 Vol27, N°3,p 129-132 |
|
Spessartine |
1,801 |
1,803 |
4,18 |
4,23 |
yellow-orange to
red-orange |
Nigeria |
84-94% spessartine, 3.5%
pyrope, 1.5-11% almandine |
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1999 Dez, p223-226 |
|
Spessartine |
1,805 |
1,81 |
4,04 |
4,13 |
|
Tongbei, China |
|
|
inert |
inert |
The Journal of Gemmology
2022 38(1), p18 |
|
Spessartine |
1,805 |
1,811 |
4,2 |
4,25 |
brown to reddish brown |
Altai, China |
|
|
inert |
inert |
Gems & Gemology 1993
winter, p273-277 |
|
Spessartine |
1,82 |
1,82 |
4,26 |
4,26 |
yellow-orange |
Namibia |
1.1 ct |
|
inert |
inert |
ACAM lab 4594 |
|
Spessartine |
|
|
4,15 |
4,18 |
|
Mozambique |
|
408, 422, 428, 460, 483
and 524nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1998 Jun, p61 |
|
Spessartine |
|
|
4,16 |
4,16 |
|
Turkey |
|
410, 420, 430, 460, 481nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1997 Sep, p126 |
|
Spessartine |
|
|
4,18 |
4,18 |
orange |
Sabaragamuwa, Sri Lanka |
|
broad absorption below
440nm, lines at 460, 480, 500nm |
inert |
inert |
GIA Gem Database 34899 |
|
Spessartine |
|
|
4,19 |
4,21 |
yellow-brown |
Congo |
0.62 - 0.84 ct, IR OTL |
strong absorptions at
409, 430, 461, 485 and 527nm |
|
|
The Journal of Gemmology
2014 Vol 34, N°4, p 299 |
|
Spessartine |
|
|
4,19 |
4,19 |
reddish orange |
Amelia, Virginia, USA |
7.94ct |
broad absorption below
440nm, lines at 465, 490, 512, 532nm |
inert |
inert |
GIA Gem Database 35227 |
|
Spessartine |
|
|
4,2 |
4,2 |
Yellowish orange |
Ibadan, Oyo, Nigeria |
11.29ct |
broad absorption below
430nm, lines at 460, 480nm |
inert |
inert |
GIA Gem Database 33251 |
|
Spessartine |
|
|
4,22 |
4,22 |
reddish orange |
Myanmar |
6.66ct |
440 nm cutoff (due to
Mn2+), a weak 520 nm line (Fe2+), and weak bands at 570, 615, and 690 nm
(Fe2+) |
inert |
inert |
Gems & Gemology 2012
Spring, p67 |
|
Spessartine |
|
|
4,22 |
4,22 |
dark orangy red |
Archer's Post, Tanzania |
14.57ct |
broad absorption below
530nm |
inert |
inert |
GIA Gem Database 34338 |
|
Spessartine |
|
|
4,24 |
4,24 |
orange |
Ethiopia |
crystal 6.46ct |
|
|
|
The Journal of Gemmology
2019 Vol 36, N°7,p591 |
TABLES
|
Stone |
RI
min |
RI
max |
Dens
min |
Dens
max |
Reference |
|
Spessartine |
1.773 |
1.81 |
4.14 |
4.23 |
Gemmo.eu
|
|
Spessartine |
1.78 |
1.811 |
4.12 |
4.25 |
http://www.gemmology.be |
|
Spessartine |
1.78 |
1.815 |
4.12 |
4.29 |
http://www.geminterest.com |
|
Spessartine |
1.787 |
1.811 |
4.12 |
4.25 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Spessartine |
1.79 |
1.81 |
3.8 |
4.25 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Spessartine |
1.79 |
1.82 |
4.12 |
4.18 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
|
Spessartine |
1.79 |
1.82 |
3.8 |
4.25 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Spessartine |
1.79 |
1.82 |
4.13 |
4.33 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Spessartine |
1.79 |
1.81 |
4.12 |
4.2 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
|
Spessartine |
1.79 |
1.81 |
4.12 |
4.2 |
Gems, R Webster,
5th edition 1994 |
|
Spessartine |
1.79 |
1.814 |
4.12 |
4.2 |
Gemology Tools Professional 2010 |
|
Spessartine |
|
|
3.9 |
4.2 |
John Sinkakas,
Gemstone and mineral data book,1972 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Spessartine |
orange |
Mn²+ in
distorted cubic coordination |
Gems & Gemology Summer 1988 |
|
Spessartine |
orange-red |
Fe²+ in
distorted cubic coordination |
Mr. Dominique Flies, La couleur des
grenats, l’Université de Nantes, 2008 |
|
Spessartine |
pink |
V³+ in
octahedral coordination, Mn²+ in distorted cubic coordination |
Mr. Dominique Flies, La couleur des
grenats, l’Université de Nantes, 2008 |
MINERAL INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
albite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
apatite |
Spessartine |
www.geminterest.com |
|
barite |
Spessartine |
Gems & gemology spring 1996 p57 |
|
braunite |
Spessartine |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft, 2010, Jun, p3-18 |
|
hematite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
ilmenite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
parvowinchite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
pyrolusite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
quartz |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
senaite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
|
tremolite |
Spessartine |
E.J. Gübelin and
J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Spessartine |
|
Darra-i-Pech
(Darra-i-Pech) Pegmatite Field |
Nangarhar (Ningarhar) Province |
Afghanistan |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
Navegador Mine |
Conselheiro Pena |
Minas Gerais |
Brazil |
Gems & Gemology Fall 2010, p 210 |
|
Spessartine |
Lavrado Escondido |
Golconda |
Minas Gerais |
Brazil |
Le Règne minéral 19/1998 |
|
Spessartine |
Poaia pegmatite,
Sao José da Safira, Governador Valadares |
Rio Doce |
Minas Gerais |
Brazil |
Gems & Gemology Fall 2010, p 210 |
|
Spessartine |
Pedra Bonita mine |
|
Rio Grande do Norte |
Brazil |
Mineralogical Record 3/2002 |
|
Spessartine |
Alto Mirador
pegmatite , Ermo, Carnauba dos Dantas |
Serido Oriental |
Rio Grande do Norte |
Brazil |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Kamtonga |
Coast Province |
Kenya |
Gems & Gemology Fall 2010, p209 |
|
Spessartine |
Ilakaka Commune, Ranohira District |
Horombe Region |
Fianarantsoa Province |
Madagascar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
|
Mahajanga (Majunga) Province |
Madagascar |
Gemmologie, Dez 1999,p 196 |
|
Spessartine |
|
Ambohimaranitra |
Mahajanga (Majunga) Province |
Madagascar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Ambohimaranitra |
Mahajanga (Majunga) Province |
Madagascar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Antaratra |
Tuléar (Toliara) Province |
Madagascar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Sakoandroa |
Tuléar (Toliara) Province |
Madagascar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
Sakhangyi |
Mogok |
Mandalay |
Myanmar |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Marienfluss |
Kunene Region |
Namibia |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1994, Jun, p39-47 |
|
Spessartine |
|
|
|
Nigeria |
Gemmologie, 1997, Mar,p31 |
|
Spessartine |
|
Iseyin |
Oyo State |
Nigeria |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Komu |
Oyo State |
Nigeria |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Ogbomosho (Ogbomoso) |
Oyo State |
Nigeria |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Azad Kashmir |
|
Pakistan |
Gems & Gemology 1996 Fall, p 218-219 |
|
Spessartine |
Donga Nur |
Muzaffarabad district |
Azad Kashmir |
Pakistan |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Loliondo |
Arusha Region |
Tanzania |
Gems & Gemology 2008 spring p 76-78 |
|
Spessartine |
|
|
Iringa Region |
Tanzania |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Nantamba |
Lindi Region |
Tanzania |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
|
Tunduru-Songea area |
Ruvuma Region |
Tanzania |
Gemmologie, 1997, Mar,p31 |
|
Spessartine |
|
Kalalani |
Tanga Region |
Tanzania |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
Umba Valley |
Lelatema Mts |
Tanga Region |
Tanzania |
Gems & Gemology Fall 2010, p210 |
|
Spessartine |
Little Three mine, Ramona |
San Diego County |
California |
USA |
Mineralogical Record 5/2002 |
|
Spessartine |
Little Three mine, Ramona |
San Diego County |
California |
USA |
Mineralogical Record 5/2002 |
|
Spessartine |
Ramona |
San Diego County |
California |
USA |
Gems & Gemology 2001 summer p278-294 |
CHEMICAL DATA
(%)
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Cr2O3 |
Fe2O3 |
|
|
Spessartine |
orange-yellow |
Minas Gerais |
Brazil |
Gems & Gemology 2001 Winter, p290 |
36.36 |
20.78 |
39.09 |
|
3.04 |
|
0.57 |
|
|
|
|
Spessartine |
light orange-yellow |
Rio Grande do Norte |
Brazil |
Gems & Gemology 2001 Winter, p290 |
36.14 |
20.5 |
38.11 |
0.96 |
2.93 |
0.08 |
0.39 |
|
|
|
|
Spessartine |
brown |
Qibeiling, Altay Mts |
China |
Gems & Gemology 1993 winter, p276 |
37.01 |
19.42 |
29.6 |
0.17 |
11.03 |
0.14 |
0.31 |
|
|
2.15 |
|
Spessartine |
orange |
|
Ethiopia |
The Journal of Gemmology
2019, Vol 36, N°7, p592 |
36.92 |
17.76 |
41.64 |
|
0.35 |
0.01 |
0.33 |
|
|
|
|
Spessartine |
orange-yellow |
Sahatany Valley |
Madagascar |
Gems & Gemology 2001 Winter, p290 |
36.35 |
20.86 |
35.89 |
|
3.39 |
|
2.85 |
|
|
|
|
Spessartine |
orange-yellow |
Sahatany Valley |
Madagascar |
Gems & Gemology 2001 Winter, p290 |
36.52 |
20.78 |
35.81 |
|
4.23 |
|
1.81 |
|
|
|
|
Spessartine |
orange |
|
Namibia |
The Journal of Gemmology 2007,30,5/6,307-319 |
36.3 |
20.64 |
37.28 |
0.01 |
5.23 |
0.13 |
0.33 |
0.02 |
|
0.19 |
|
Spessartine |
orange |
|
Namibia |
Gems & Gemology 2001 Winter, p290 |
35.31 |
19.61 |
40.11 |
2.95 |
0.99 |
0.06 |
0.49 |
|
|
|
|
Spessartine |
|
Marienfluss, Kunene |
Namibia |
Zeitschrift der deutschen gemmologischen
Gesellschaft, 1994, Jun, p42 |
33.93 |
18.87 |
42.45 |
2.87 |
1.08 |
0.11 |
0.58 |
|
|
|
|
Spessartine |
|
Marienfluss, Kunene |
Namibia |
Zeitschrift der deutschen gemmologischen
Gesellschaft, 1994, Jun, p42 |
34 |
19.17 |
42.6 |
2.71 |
0.93 |
|
0.5 |
|
|
|
|
Spessartine |
|
Marienfluss, Kunene |
Namibia |
Zeitschrift der deutschen gemmologischen
Gesellschaft, 1994, Jun, p42 |
36.7 |
20.35 |
37.63 |
3.2 |
0.89 |
|
0.41 |
|
|
|
|
Spessartine |
orange-yellow |
|
Nigeria |
Gems & Gemology 2001 Winter, p290 |
36.1 |
21.4 |
40.6 |
0.94 |
0.64 |
|
0.27 |
|
|
|
|
Spessartine |
orange |
|
Nigeria |
The Journal of Gemmology
2000, Vol27, N°3,p130 |
36.68 |
21.21 |
40.38 |
0.67 |
0.62 |
0.07 |
0.27 |
|
0.07 |
|
|
Spessartine |
orange |
|
Nigeria |
The Journal of Gemmology
2000, Vol27, N°3,p130 |
37.04 |
21.4 |
37.67 |
0.99 |
2.77 |
0.01 |
0.09 |
|
0.03 |
|
|
Spessartine |
orange |
|
Nigeria |
The Journal of Gemmology
2000, Vol27, N°3,p130 |
36.55 |
21.36 |
39.36 |
0.96 |
1.44 |
0.08 |
0.19 |
|
0.05 |
|
|
Spessartine |
orange |
|
Nigeria |
The Journal of Gemmology
2000, Vol27, N°3,p130 |
37.02 |
21.48 |
37.76 |
0.85 |
2.44 |
0.09 |
0.35 |
|
0.02 |
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
36.29 |
21.18 |
40.52 |
0.91 |
0.79 |
|
0.31 |
|
|
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
36.14 |
21.38 |
40.64 |
0.94 |
0.64 |
|
0.27 |
|
|
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
36.11 |
20.82 |
36.8 |
0.83 |
4.85 |
|
0.58 |
|
|
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
35.92 |
20.92 |
36.82 |
0.85 |
4.87 |
|
0.62 |
|
|
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
37.09 |
21.49 |
37.57 |
0.87 |
2.85 |
|
0.14 |
|
|
|
|
Spessartine |
|
|
Nigeria |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 1999, Dez p224 |
37.06 |
21.52 |
37.5 |
0.86 |
2.88 |
|
0.18 |
|
|
|
|
Spessartine |
orange-red |
|
Pakistan |
Gems & Gemology 2001 Winter, p290 |
36.39 |
20.6 |
36.98 |
|
4.45 |
|
1.58 |
|
|
|
|
Spessartine |
|
|
Pakistan |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 2010, Jun, p6 |
35.9 |
20.3 |
35.13 |
|
5.67 |
0.04 |
1.58 |
|
0.004 |
|
|
Spessartine |
|
|
Tanzania |
Gemmologie, Zeitschrift der deutschen gemmologischen
Gesellschaft, 2010, Jun, p6 |
37.41 |
21.14 |
34.81 |
4.73 |
|
0.07 |
1.57 |
|
0.01 |
|
|
Spessartine |
light orange |
Ramona, California |
USA |
Gems & Gemology 2001 Winter, p290 |
36.3 |
20.56 |
40.67 |
|
2.06 |
0.07 |
0.18 |
|
|
|
|
Spessartine |
medium light orange |
Ramona, California |
USA |
Gems & Gemology 2001 Winter, p290 |
36.58 |
20.38 |
40.02 |
|
2.89 |
0.06 |
0.07 |
|
|
|
|
Spessartine |
medium light orange |
Ramona, California |
USA |
Gems & Gemology 2001 Winter, p290 |
36.71 |
20.28 |
38.33 |
|
3.62 |
0.07 |
0.06 |
|
|
|
|
Spessartine |
medium yellow |
Ramona, California |
USA |
Gems & Gemology 2001 Winter, p290 |
36.72 |
20.49 |
37.16 |
|
4.64 |
0.04 |
0.06 |
|
|
|
|
Spessartine |
orange-yellow |
|
Zambia |
Gems & Gemology 2001 Winter, p290 |
36.51 |
20.79 |
40.86 |
|
1.53 |
|
0.22 |
|
|
|