|
INVESTIGATIONS
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
Colour |
Locality |
Info |
nx min |
nx max |
ny min |
ny max |
nz min |
nz max |
Spectrum |
UVS |
UVL |
Reference |
Zoisite |
1,688 |
1,7 |
0,008 |
0,01 |
3,35 |
3,37 |
bluish green to yellowish
green |
Merelani Hills, Tanzania |
|
|
|
|
|
|
|
broad absorption of the
violet and most of the blue, weak to distinct bands at 660 and 680nm |
inert |
inert |
Gems & Gemology 1992
spring p4-15 |
Tanzanite - zoisite |
1,689 |
1,7 |
0,011 |
0,011 |
3,37 |
3,37 |
violetish blue |
|
0.39 - 0.82 ct, colour
coated with titanium |
|
|
|
|
|
|
|
|
|
Gems & Gemology 2014
Spring, p71 |
Zoisite |
1,69 |
1,7 |
0,01 |
0,01 |
3,44 |
3,44 |
brown |
|
biaxial + |
|
|
|
|
|
|
|
|
|
ACAM labo |
Zoisite |
1,69 |
1,7 |
|
|
3,37 |
3,37 |
bicoloured: pink and
yellow |
|
1.62 and 4.30 ct |
|
|
|
|
|
|
band at 455nm |
inert |
very weak yellow |
Gems & Gemology 2000
Summer, p159 |
Tanzanite - zoisite |
1,69 |
1,69 |
|
|
3,38 |
3,38 |
medium dark greyish violet-blue |
|
2.69ct, cabochon
cat's-eye, RI by spot, chatoyancy caused by channels |
|
|
|
|
|
|
|
inert |
inert |
The Journal of Gemmology
1991 Vol 22, N°7, p397 |
Zoisite |
1,69 |
1,7 |
0,01 |
0,01 |
3,36 |
3,36 |
brown |
|
12.20ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 34127 |
Zoisite |
1,69 |
1,7 |
0,01 |
0,01 |
3,35 |
3,35 |
orange |
Tanzania |
2.96ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35075 |
Zoisite |
1,69 |
1,7 |
0,01 |
0,01 |
3,37 |
3,37 |
orangy yellow |
Tanzania |
5.00ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35620 |
Tanzanite - zoisite |
1,69 |
1,702 |
0,012 |
0,012 |
3,36 |
3,36 |
violetish blue |
Tanzania |
8.85ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 34129 |
Tanzanite - zoisite |
1,69 |
1,7 |
0,01 |
0,01 |
3,36 |
3,36 |
|
Tanzania |
11.18ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35038 |
Zoisite |
1,69 |
1,7 |
|
|
|
|
purple-red (dyed), green
(dyed) |
|
dyed imitating ruby and
emerald, 2 briolettes |
|
|
|
|
|
|
|
|
|
http://gtljaipur.info
2021 vol78, May |
Tanzanite - zoisite |
1,691 |
1,7 |
0,009 |
0,009 |
3,33 |
3,33 |
blue |
Tanzania |
1.92ct |
1,691 |
1,691 |
1,695 |
1,695 |
1,700 |
1,700 |
|
inert |
inert |
ACAM lab 2163 |
Zoisite |
1,692 |
1,698 |
0,006 |
0,006 |
3,39 |
3,39 |
green |
Tanzania |
3.20ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35072 |
Zoisite |
1,694 |
1,702 |
0,008 |
0,008 |
3,33 |
3,37 |
very light brownish
purple |
Shinwari tribal area,
Nangarhar Province, Afghanistan |
|
1,694 |
1,694 |
1,695 |
1,695 |
1,702 |
1,702 |
427nm and 452nm lines |
inert |
inert |
Gems & Gemology 2009
spring p 70 |
Zoisite |
1,695 |
1,703 |
0,008 |
0,008 |
3,35 |
3,35 |
greenish yellow |
|
8.33 ct |
|
|
|
|
|
|
none |
inert |
inert |
The Australian
Gemmologist 2010 Vol 24, N°4,p90-91 |
Zoisite |
1,695 |
1,7 |
0,005 |
0,005 |
3,36 |
3,36 |
dark yellowish green |
Merelani Hills, Lelatema
Mts, Arusha Region, Tanzania |
6.11ct |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 35522 |
Tanzanite - zoisite |
1,695 |
|
|
|
3,36 |
3,36 |
bluish violet |
Tanzania |
11.98ct, biaxial + |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 34128 |
Zoisite |
1,701 |
1,707 |
|
|
3,38 |
3,38 |
brownish yellow-green |
Alchuri, Pakistan |
|
|
|
|
|
|
|
absorption at 430nm and
450nm |
inert |
inert |
Gems & Gemology 2012
Fall, p230 |
TABLES
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
nx
min |
nx max |
ny
min |
ny
max |
nz
min |
nz
max |
Reference |
Zoisite |
1.685 |
1.725 |
0.004 |
0.01 |
3.15 |
3.38 |
1.685 |
1.705 |
|
|
1.697 |
1.725 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Zoisite |
1.685 |
1.725 |
0.004 |
0.008 |
3.15 |
3.38 |
|
|
|
|
|
|
http://www.gemmology.be |
Zoisite |
1.685 |
1.725 |
0.004 |
0.008 |
3.15 |
3.38 |
1.685 |
1.705 |
1.688 |
1.710 |
1.697 |
1.725 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
Zoisite |
1.685 |
1.725 |
0.004 |
0.013 |
3.1 |
3.45 |
1.685 |
1.705 |
1.688 |
1.710 |
1.697 |
1.725 |
http://www.geminterest.com |
Zoisite |
1.685 |
1.725 |
0.004 |
0.012 |
3.15 |
3.55 |
1.685 |
1.705 |
1.688 |
1.710 |
1.697 |
1.725 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Zoisite |
1.685 |
1.725 |
0.004 |
0.008 |
3.1 |
3.45 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
Tanzanite - zoisite |
1.686 |
1.705 |
0.008 |
0.013 |
3.1 |
3.6 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
Tanzanite - zoisite |
1.69 |
1.709 |
0.006 |
0.012 |
3.23 |
3.55 |
1.690 |
1.700 |
|
|
1.699 |
1.709 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Tanzanite - zoisite |
1.69 |
1.706 |
0.008 |
0.013 |
3.34 |
3.43 |
1.690 |
1.700 |
1.693 |
1.693 |
1.698 |
1.706 |
http://www.geminterest.com |
Tanzanite - zoisite |
1.69 |
1.702 |
0.006 |
0.012 |
3.33 |
3.36 |
|
|
|
|
|
|
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Zoisite |
1.69 |
1.706 |
0.006 |
0.01 |
3.25 |
3.55 |
1.690 |
1.700 |
|
|
1.700 |
1.706 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Zoisite |
1.69 |
1.707 |
0.008 |
0.009 |
3.2 |
3.5 |
1.690 |
1.700 |
1.693 |
1.703 |
1.698 |
1.707 |
Gemmological Tables, Ulrich Henn,
2004 |
Tanzanite - zoisite |
1.691 |
1.7 |
0.009 |
0.009 |
3.35 |
3.35 |
|
|
|
|
|
|
http://www.gemmology.be |
Zoisite |
1.691 |
1.7 |
0.008 |
0.008 |
3.12 |
3.37 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
Zoisite |
1.691 |
1.706 |
1.691 |
1.706 |
3.1 |
3.4 |
1.691 |
1.700 |
|
|
1.700 |
1.706 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Zoisite |
1.691 |
1.702 |
0.008 |
0.01 |
3.05 |
3.43 |
|
|
|
|
|
|
Gemmo.eu
|
Tanzanite - zoisite |
1.692 |
1.7 |
0.009 |
0.009 |
3.35 |
3.35 |
1.692 |
1.692 |
1.693 |
1.693 |
1.700 |
1.700 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
Zoisite |
1.692 |
1.7 |
0.008 |
0.008 |
3.35 |
3.35 |
|
|
|
|
|
|
Gems, R Webster,
5th edition 1994 |
Thulite - zoisite |
1.695 |
1.701 |
0.006 |
0.006 |
3.09 |
3.09 |
|
|
|
|
|
|
http://www.gemmology.be |
Thulite - zoisite |
1.695 |
1.701 |
0.006 |
0.006 |
3.09 |
3.09 |
1.695 |
1.695 |
|
|
1.701 |
1.701 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
Thulite - zoisite |
1.695 |
1.701 |
0.006 |
0.006 |
3.09 |
3.1 |
1.695 |
1.695 |
1.696 |
1.697 |
1.701 |
1.701 |
http://www.geminterest.com |
Thulite - zoisite |
1.695 |
1.701 |
0.006 |
0.006 |
3.09 |
3.09 |
|
|
|
|
|
|
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Thulite - zoisite |
1.695 |
1.701 |
0.006 |
0.006 |
3.09 |
3.09 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
Thulite - zoisite |
1.7 |
1.71 |
|
|
3.25 |
3.27 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
Thulite - zoisite |
1.7 |
1.706 |
0.006 |
0.006 |
3.09 |
3.12 |
|
|
|
|
|
|
Gems, R Webster,
5th edition 1994 |
Thulite - zoisite |
|
|
|
|
3.1 |
3.37 |
|
|
|
|
|
|
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Tanzanite - zoisite |
blue |
V4+ in octahedral
coordination; with V³+ in octahedral
coordination |
Gems & Gemology Summer 1988 |
Zoisite |
brown-violet |
V³+
in octahedral coordination |
Gems & Gemology Summer 1988 |
Zoisite |
green |
Cr and V |
Gems & Gemology 1992 Spring p4-15 |
Thulite - zoisite |
pink |
Mn³+ in
presumably octahedral coordination |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
Inclusion |
Stone |
Reference |
actinolite |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
calciet |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
diopside |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
graphite |
Tanzanite |
E.J. Gübelin and J.I.
Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
gypsum |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
merelaniite |
Tanzanite |
Gems & Gemology 2018 Summer, p 226 |
quartz |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
rutile |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
titanite |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
xenotime |
Tanzanite |
Bulletin of the Geological
Society of Finland, Vol. 58, No. 2, 1986, pp. 53-58. |
zircon |
Tanzanite |
E.J. Gübelin and J.I.
Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005) |
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
Zoisite |
|
Shinwari tribal area |
Nangarhar (Ningarhar) Province |
Afghanistan |
Gems & Gemology Spring 2009 p70 |
Zoisite |
Alchuri |
Shigar Valley |
Baltistan |
Pakistan |
Gems & Gemology Fall 2010, p215 |
tanzanite-Zoisite |
Merelani Hills, Umba Valley |
Lelatema Mts |
Arusha region |
Tanzania |
Lapis 1997/9 |
Zoisite |
|
Longido |
Kilimanjaro Region |
Tanzania |
Gemmologie, 1997, Mar,p31 |
CHEMICAL DATA
(%)
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Cr2O3 |
V2O3 |
Ga2O3 |
ZnO |
Fe2O3 |
K2O |
H2O |
SrO |
|
Zoisite |
medium green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.82 |
32.89 |
0.02 |
0.09 |
|
0.04 |
23.91 |
|
0.3 |
0.07 |
0.03 |
0.02 |
0.01 |
|
|
0.27 |
Zoisite |
dark green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.61 |
33.41 |
|
0.03 |
|
0.03 |
24.01 |
|
0.16 |
0.09 |
0.01 |
0.01 |
0.01 |
|
|
0.26 |
Zoisite |
dark bluish green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.8 |
33.23 |
0.01 |
0.06 |
|
0.06 |
23.93 |
|
0.26 |
0.06 |
0.03 |
0.02 |
0.01 |
|
|
0.27 |
Zoisite |
medium bluish green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.76 |
33.11 |
0.01 |
0.05 |
|
0.03 |
24.15 |
|
0.17 |
0.1 |
0.03 |
0.01 |
|
|
|
0.27 |
Zoisite |
medium bluish green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.49 |
33.01 |
0.01 |
0.02 |
|
0.01 |
24.02 |
|
0.13 |
0.09 |
0.02 |
|
|
|
|
0.35 |
Zoisite |
medium yellow green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
38.91 |
33.25 |
0.01 |
0.05 |
|
0.04 |
23.91 |
|
0.09 |
0.11 |
0.04 |
|
0.01 |
|
|
0.23 |
Zoisite |
medium yellow green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.1 |
33.24 |
|
0.04 |
|
0.03 |
24 |
|
0.11 |
0.17 |
0.01 |
0.01 |
|
|
|
0.06 |
Zoisite |
light yellow green |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.59 |
33.34 |
|
0.04 |
|
0.01 |
24.25 |
|
0.09 |
0.16 |
0.02 |
0.01 |
0.01 |
|
|
0.14 |
Zoisite |
medium slightly
greenish blue (heated) |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.58 |
33.25 |
0.01 |
0.05 |
|
0.05 |
24.16 |
|
0.12 |
0.13 |
0.03 |
|
0.01 |
|
|
0.21 |
Zoisite |
medium slightly
greenish blue (heated) |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
38.3 |
33.24 |
0.01 |
0.04 |
|
0.02 |
23.98 |
|
0.11 |
0.16 |
0.01 |
0.02 |
0.01 |
|
|
0.13 |
Zoisite |
medium blue |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.89 |
33.2 |
|
0.05 |
|
0.03 |
23.88 |
|
0.05 |
0.16 |
0.03 |
0.01 |
0.02 |
|
|
0.54 |
Zoisite |
medium violet blue |
Merelani Hills |
Tanzania |
Gems & Gemology 1992 Spring p13 |
39.02 |
33.42 |
0.02 |
0.05 |
|
0.04 |
24.12 |
|
0.04 |
0.16 |
0.03 |
0.01 |
0.01 |
|
|
0.09 |
Zoisite |
cat's eye |
|
East Africa |
The Journal of
Gemmology 1995, Vol 24, N°8, p 574 |
40.1 |
33.4 |
0.04 |
0.14 |
1.11 |
0.05 |
23.5 |
0.1 |
|
|
|
|
|
|
1.1 |
0 |
Zoisite |
cat's eye |
|
East Africa |
The Journal of
Gemmology 1995, Vol 24, N°8, p 574 |
41.1 |
32.47 |
0.04 |
0.15 |
0.05 |
0.09 |
23.91 |
0.74 |
|
|
|
|
|
0.21 |
1.13 |
0 |
Zoisite |
cat's eye |
|
East Africa |
The Journal of
Gemmology 1995, Vol 24, N°8, p 574 |
41.76 |
32.95 |
0.05 |
0.17 |
0.07 |
0.14 |
24.01 |
0.53 |
|
|
|
|
|
0.2 |
0.14 |
0 |