|
INVESTIGATIONS
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 |
Allanite |
1.64 |
1.828 |
0.013 |
0.036 |
3.40 |
4.20 |
|
|
|
|
|
|
http://www.gemmology.be
|
Allanite |
1.64 |
1.828 |
0.013 |
0.036 |
3.40 |
4.20 |
1.640 |
1.791 |
1.650 |
1.581 |
1.660 |
1.828 |
http://www.geminterest.com
|
Allanite |
1.64 |
1.828 |
0.013 |
0.036 |
3.40 |
4.20 |
1.640 |
1.791 |
1.650 |
1.815 |
1.660 |
1.828 |
Joel Arem, Color Encyclopedia
of Gemstones, 1987
|
Allanite |
1.64 |
1.828 |
0.013 |
0.036 |
3.40 |
4.20 |
1.640 |
1.791 |
1.650 |
1.815 |
1.660 |
1.828 |
Tables of Gemstone
Identification, Roger Dedeyne, Ivo Quintens, 2007
|
Allanite |
1.64 |
1.828 |
0.019 |
0.045 |
3.4 |
4.2 |
|
|
|
|
|
|
Gemology Tools Professional 2010
|
Allanite |
1.645 |
1.825 |
0.01 |
0.035 |
3.5 |
4.2 |
|
|
|
|
|
|
Gemmo.eu 2013
|
CAUSE OF COLOUR
Stone |
Colour |
Cause of
colour |
Reference |
Allanite |
brown |
colored by iron and radiation
damage and possibly by rare earth
elements |
http://minerals.caltech.edu |
MINERAL INCLUSIONS