|
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 |
Nifontovite |
1.575 |
1.583 |
0.008 |
0.008 |
2.37 |
2.37 |
colourless |
Mexico |
0.19 ct |
1.575 |
1.575 |
1.578 |
1.578 |
1.583 |
1.583 |
|
very weak
yellowish |
weak
violet |
http://www.geminterest.com 2009
|
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 |
Nifontovite |
1.573 |
1.585 |
0.009 |
0.011 |
2.35 |
2.36 |
1.573 |
1.575 |
|
|
1.584 |
1.585 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)