|
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 |
Sepiolite |
1.49 |
1.53 |
0.009 |
0.02 |
2 |
2 |
1.490 |
1.522 |
|
|
1.505 |
1.530 |
Gemmological Tables, Ulrich Henn, 2004
|
Sepiolite |
1.518 |
1.53 |
0.01 |
0.01 |
1.98 |
2.02 |
1.518 |
1.520 |
|
|
1.525 |
1.530 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
Sepiolite |
1.52 |
1.53 |
|
|
2 |
2.29 |
1.520 |
1.520 |
|
|
1.530 |
1.530 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Sepiolite |
1.53 |
1.53 |
|
|
2 |
2 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine, Birgit
Günther, 1981
|
Sepiolite |
1.53 |
1.53 |
|
|
1 |
2 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)