|
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 |
|
Pyrophyllite
|
1.56 |
1.57 |
|
|
2.65 |
2.9 |
white, yellowish green, dark
purple, yellow, rownish red and
grey |
|
semitranslucent and opaque, RI:
distant vision, jade simulant |
|
|
|
|
|
|
|
inert to strong
white |
inert to strong
white |
The Journal of Gemmology 2010
Vol 32, N°1-4, p68 |
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 |
|
Pyrophyllite
|
1.534 |
1.601 |
0.048 |
0.05 |
2.65 |
2.9 |
1.534 |
1.556 |
|
|
1.596 |
1.601 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
|
Pyrophyllite
|
1.534 |
1.601 |
0.05 |
0.05 |
2.65 |
2.9 |
1.534 |
1.556 |
1.586 |
1.589 |
1.596 |
1.601 |
Joel Arem, Color Encyclopedia
of Gemstones, 1987
|
|
Pyrophyllite
|
1.534 |
1.601 |
0.05 |
0.05 |
2.65 |
2.9 |
1.534 |
1.556 |
1.586 |
1.589 |
1.596 |
1.601 |
http://www.geminterest.com
|
|
Pyrophyllite
|
1.534 |
1.601 |
0.05 |
0.05 |
2.65 |
2.9 |
1.534 |
1.556 |
1.586 |
1.589 |
1.596 |
1.601 |
Tables of Gemstone
Identification, Roger Dedeyn, Ivo Quintens, 2007
|
|
Pyrophyllite
|
1.55 |
1.62 |
|
|
2.8 |
2.8 |
|
|
|
|
|
|
John Sinkakas, Gemstone and
mineral data book,1972
|
|
Pyrophyllite
|
1.55 |
1.6 |
|
|
2.8 |
2.8 |
|
|
|
|
|
|
Gems, R Webster, 5th edition
1994
|
|
Pyrophyllite
|
1.552 |
1.6 |
0.048 |
0.048 |
2.8 |
2.9 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine, Birgit
Günther, 1981
|
|
Pyrophyllite
|
1.552 |
1.601 |
0.045 |
0.048 |
2.8 |
2.8 |
1.552 |
1.556 |
1.588 |
1.589 |
1.600 |
1.601 |
Gemmological Tables, Ulrich Henn, 2004
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)