|
INVESTIGATIONS
TABLES
|
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
|
Fergusonite |
2.05 |
2.19 |
|
|
5.6 |
5.8 |
|
|
|
|
Joel Arem, Color Encyclopedia of Gemstones,
1987
|
|
Fergusonite |
|
|
|
|
5.4 |
5.4 |
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972
|
|
Fergusonite |
2.05 |
2.19 |
|
|
5.6 |
5.8 |
|
|
|
|
http://www.geminterest.com
|
|
Fergusonite |
2.05 |
2.19 |
|
|
5.6 |
5.8 |
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA