|
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 |
|
Euclase |
1,649 |
1,669 |
0,02 |
0,02 |
3,1 |
3,1 |
bluish green |
Ouro Preto, Minas Gerais,
Brazil |
7.17ct |
|
|
|
|
|
|
|
inert |
very weak green |
GIA Gem Database
34010 |
|
Euclase |
1,65 |
1,672 |
0,019 |
0,025 |
2,99 |
3,1 |
blue-green |
Guavio, Chivor, Colombia |
|
1,650 |
1,650 |
1,656 |
1,656 |
1,672 |
1,672 |
465, 468, 704, 705 nm |
|
|
Revue de Gemmologie A.F.G. 2000 n°140, juillet p
18-20 |
|
Euclase |
1,65 |
1,67 |
0,02 |
0,02 |
3,08 |
3,08 |
colourless |
|
|
|
|
|
|
|
|
|
|
|
ACAM labo |
|
Euclase |
1,65 |
1,672 |
0,022 |
0,022 |
3,09 |
3,09 |
colourless |
Sri Lanka |
5.44ct |
|
|
|
|
|
|
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1999 Jul p106 |
|
Euclase |
1,65 |
1,668 |
0,018 |
0,018 |
3,18 |
3,18 |
bluish green |
Dom Bosco mine, Ouro
Preto, Minas Gerais, Brazil |
7.79ct |
|
|
|
|
|
|
line at 710nm |
inert |
inert |
GIA Gem Database
34279 |
|
Euclase |
1,65 |
1,67 |
0,02 |
0,02 |
3,1 |
3,1 |
greenish blue |
Chivor Mine, Colombia |
9.50ct |
|
|
|
|
|
|
none |
inert |
inert |
Gems & Gemology 2006 summer, p173 |
|
Euclase |
1,65 |
1,67 |
0,02 |
0,02 |
3,13 |
3,13 |
blue |
Lost Hope Mine, Zimbabwe |
2.87ct |
|
|
|
|
|
|
broad absorption above 630nm |
inert |
inert |
GIA Gem Database
35285 |
|
Euclase |
1,65 |
1,67 |
0,02 |
0,02 |
3,08 |
3,08 |
blue |
Zimbabwe |
11,77ct |
|
|
|
|
|
|
|
inert |
inert |
The Journal of Gemmology
2022 38(2), p119 |
|
Euclase |
1,651 |
1,673 |
0,02 |
0,02 |
3,06 |
3,13 |
blue |
Zimbabwe |
|
1,651 |
1,653 |
1,655 |
1,657 |
1,671 |
1,673 |
none |
|
|
The Journal of Gemmology
1998 Vol 26, N°4, p209-218 |
|
Euclase |
1,651 |
1,671 |
0,018 |
0,02 |
3,07 |
3,08 |
green-blue |
Chivor Mine, Colombia |
1.08 and 3.98 ct |
1,651 |
1,653 |
|
|
1,671 |
1,671 |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2009 58/3-4/Dec, p83 |
|
Euclase |
1,651 |
1,67 |
0,019 |
0,019 |
3,09 |
3,09 |
very dark violetish blue |
Lost Hope Mine, Mwami,
Zimbabwe |
1.81ct |
|
|
|
|
|
|
broad absorption above 600nm |
inert |
inert |
GIA Gem Database 35398 |
|
Euclase |
1,651 |
1,678 |
0,02 |
0,02 |
3,08 |
3,1 |
|
Rodrigo Silva ,Ouro
Preto, Minas Gerais, Brazil |
|
1,65 |
1,66 |
|
|
1,67 |
1,68 |
|
|
|
The Journal of Gemmology
1969 N°8,p313 |
|
Euclase |
1,652 |
1,672 |
0,019 |
0,019 |
3,06 |
3,13 |
sapphire blue |
Karoi, Zimbabwe |
2V=48° |
1,652 |
1,653 |
1,656 |
1,656 |
1,671 |
1,672 |
|
|
|
Gems & Gemology 1978
Winter p104-110 |
|
Euclase |
1,652 |
1,671 |
0,019 |
0,019 |
3,09 |
3,09 |
orangy pink |
|
4.08ct |
|
|
|
|
|
|
|
inert |
inert |
Gems & Gemology 2021 winter, p375 |
|
Euclase |
1,652 |
1,673 |
0,021 |
0,021 |
3,1 |
3,1 |
pink-orange |
Bahia, Brazil |
2,99 and 3,5ct |
|
|
|
|
|
|
|
inert |
inert |
The Journal of Gemmology
2022 38(1), p44-61 |
|
Euclase |
1,653 |
1,669 |
0,016 |
0,016 |
3,075 |
3,075 |
|
Zimbabwe |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
1980 Vol 17, N°1, p18-29 |
|
Euclase |
1,653 |
1,665 |
0,012 |
0,012 |
3,09 |
3,09 |
very light yellow |
Sri Lanka |
|
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 34834 |
|
Euclase |
1,654 |
1,673 |
0,019 |
0,019 |
3,11 |
3,11 |
greenish blue |
Chivor, Colombia |
chelsea: red |
1,654 |
1,654 |
1,658 |
1,658 |
1,673 |
1,673 |
400-410, 412, 420, 453,
689, 706-708nm |
|
|
The Journal of Gemmology
1996 Vol25, N°3, p175-176 |
|
Euclase |
1,658 |
1,678 |
0,02 |
0,02 |
3,09 |
3,09 |
blue |
|
3.09ct |
|
|
|
|
|
|
|
inert |
inert |
ACAM lab 644 |
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 |
|
Euclase |
1.648 |
1.677 |
0.019 |
0.025 |
3 |
3.13 |
1.648 |
1.658 |
|
|
1.671 |
1.677 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Euclase |
1.648 |
1.678 |
0.018 |
0.025 |
2.98 |
3.14 |
|
|
|
|
|
|
Gemmo.eu
|
|
Euclase |
1.649 |
1.677 |
0.019 |
0.025 |
3.08 |
3.12 |
1.649 |
1.654 |
1.656 |
1.658 |
1.671 |
1.677 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Euclase |
1.649 |
1.676 |
0.019 |
0.025 |
2.99 |
3.15 |
1.649 |
1.652 |
1.655 |
1.658 |
1.669 |
1.676 |
http://www.geminterest.com |
|
Euclase |
1.65 |
1.677 |
0.019 |
0.025 |
3.06 |
3.14 |
1.650 |
1.654 |
|
|
1.671 |
1.677 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
|
Euclase |
1.65 |
1.676 |
0.019 |
0.025 |
2.99 |
3.1 |
|
|
|
|
|
|
http://www.gemmology.be |
|
Euclase |
1.65 |
1.678 |
0.019 |
0.02 |
3.09 |
3.11 |
1.650 |
1.658 |
|
|
1.670 |
1.678 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
|
Euclase |
1.65 |
1.676 |
0.019 |
0.025 |
2.99 |
3.13 |
1.650 |
1.652 |
1.655 |
1.658 |
1.671 |
1.676 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Euclase |
1.65 |
1.676 |
0.019 |
0.025 |
2.99 |
3.13 |
1.650 |
1.652 |
1.655 |
1.658 |
1.671 |
1.676 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Euclase |
1.65 |
1.677 |
0.019 |
0.02 |
3 |
3.12 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
|
Euclase |
1.652 |
1.672 |
|
|
3.1 |
3.1 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
|
Euclase |
1.652 |
1.672 |
0.02 |
0.02 |
3.1 |
3.1 |
|
|
|
|
|
|
Gems, R Webster,
5th edition 1994 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Euclase |
blue |
Fe²+-O-Fe³+
charge transfer |
Gems & Gemology Summer 1988 |
|
Euclase |
green |
Cr³+ in octahedral coordination |
Gems & Gemology Summer 1988 |
|
Euclase |
greenish blue |
Cr³+ in octahedral coordination |
Gems & Gemology Summer 1993 p 126 |
MINERAL
INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
albite |
Euclase |
Revue de Gemmologie AF.G n°140 - Juillet
2000 p18-20 |
|
apatite |
Euclase |
Dr. W.F. Eppler, Praktische Gemmologie,
1984 |
|
calcite |
Euclase |
Revue de Gemmologie AF.G n°140 - Juillet
2000 p18-20 |
|
dolomite |
Euclase |
Revue de Gemmologie AF.G n°140 - Juillet
2000 p18-20 |
|
hematite |
Euclase |
The Journal of
Gemmology 1998, Vol 26, N°4, p216 |
|
hematite |
Euclase |
Dr. W.F. Eppler, Praktische Gemmologie,
1984 |
|
mica |
Euclase |
Revue de Gemmologie AF.G n°140 - Juillet
2000 p18-20 |
|
pyrite |
Euclase |
The Journal of
Gemmology 1998, Vol 26, N°4, p217 |
|
quartz |
Euclase |
Revue de Gemmologie AF.G n°140 - Juillet
2000 p18-20 |
|
rutile |
Euclase |
www.hetsteenenhuis.com |
|
zircon |
Euclase |
The Journal of
Gemmology 1998, Vol 26, N°4, p216 |
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Euclase |
|
Guavio |
Chivor |
Colombia |
Revue de Gemmologie A.F.G. 2000 n°140,
juillet p 18-20 |
|
Euclase |
|
|
|
Sri Lanka |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1999 Jul p106 |
|
Euclase |
|
Magogoni |
Morogoro Region |
Tanzania |
Gemmologie, 1997, Mar,p31 |
|
Euclase |
|
Karoi (Urungwe; Hurungwe) District |
Mashonaland West |
Zimbabwe |
Gems & Gemology 1978 Winter p104-110 |
CHEMICAL DATA
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
FeO |
CaO |
BeO |
H2O |
F |
|
|
Euclase |
|
|
Brazil |
The Journal of
Gemmology 1980, Vol 17, N°1, p26 |
41.63 |
34.06 |
1.03 |
0.14 |
16.97 |
6.04 |
0.38 |