|
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 |
|
Gadolinite |
1,77 |
|
|
|
4,25 |
4,25 |
black |
|
22,33ct, ranged from
1.770 to OTL, birefringence > 0.040 |
|
|
|
|
|
|
|
|
|
Gems & Gemology 2025
Spring, p58 |
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 |
|
Gadolinite |
1.77 |
1.82 |
0.01 |
0.04 |
4 |
4.65 |
1.770 |
1.780 |
|
|
1.780 |
1.820 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Gadolinite |
1.77 |
1.82 |
0.01 |
0.04 |
4 |
4.65 |
|
|
|
|
|
|
http://www.gemmology.be |
|
Gadolinite |
1.77 |
1.82 |
0.01 |
0.04 |
4 |
4.65 |
1.770 |
1.780 |
|
|
1.780 |
1.820 |
http://www.geminterest.com |
|
Gadolinite |
|
|
|
|
4 |
4.5 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
|
Gadolinite |
1.77 |
1.82 |
0.01 |
0.04 |
4 |
4.65 |
1.770 |
1.780 |
|
|
1.780 |
1.820 |
Tables of
Gemstone Identification, Roger Dedeyn, Ivo Quintens, 2007 |
CAUSE OF
COLOUR
MINERAL
INCLUSIONS
LOCALITIES
CHEMICAL DATA