|
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 |
Ludlamite |
1.65 |
1.69 |
0.04 |
0.04 |
|
|
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972
|
Ludlamite |
1.65 |
1.697 |
0.038 |
0.044 |
3.19 |
3.19 |
1.650 |
1.653 |
1.667 |
1.675 |
1.688 |
1.697 |
http://www.geminterest.com
|
Ludlamite |
1.65 |
1.697 |
0.036 |
0.044 |
3.19 |
3.19 |
1.650 |
1.653 |
|
|
1.688 |
1.697 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Ludlamite |
1.65 |
1.697 |
0.038 |
0.044 |
3.19 |
3.19 |
|
|
|
|
|
|
http://www.gemmology.be
|
Ludlamite |
1.65 |
1.697 |
0.038 |
0.044 |
3.19 |
3.19 |
1.650 |
1.653 |
1.667 |
1.675 |
1.688 |
1.697 |
Joel Arem, Color Encyclopedia of Gemstones,
1987
|
Ludlamite |
1.65 |
1.693 |
0.04 |
0.04 |
3.19 |
3.19 |
1.650 |
1.653 |
|
|
1.689 |
1.693 |
Gems, R Webster, 5th edition 1994
|
Ludlamite |
1.65 |
1.697 |
0.039 |
0.04 |
3.1 |
3.1 |
1.650 |
1.653 |
|
|
1.689 |
1.697 |
Bestimmungstabellen für Edelsteine, Birgit
Günther, 2008
|
Ludlamite |
1.65 |
1.697 |
0.038 |
0.044 |
3.19 |
3.19 |
1.650 |
1.653 |
1.667 |
1.675 |
1.688 |
1.697 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
Ludlamite |
1.653 |
1.693 |
0.04 |
0.04 |
3.1 |
3.1 |
1.653 |
1.653 |
1.673 |
1.673 |
1.693 |
1.693 |
Gemmological Tables, Ulrich Henn, 2004
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)