|
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 |
|
piemontite |
1.73 |
|
|
|
|
|
pink |
Shadow Lake area, California,
USA |
0.24ct |
|
|
|
|
|
|
|
|
|
Gems & Jewellery 2009
october, Volume 18 / No.
4 |
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 |
|
Piemontite
|
1.732 |
1.832 |
0.025 |
0.073 |
3.2 |
3.52 |
1.732 |
1.794 |
|
|
1.762 |
1.832 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
|
Piemontite
|
1.732 |
1.829 |
0.025 |
0.073 |
4.03 |
4.03 |
1.732 |
1.794 |
1.750 |
1.807 |
1.762 |
1.829 |
http://www.geminterest.com
|
|
Piemontite
|
1.732 |
1.829 |
0.025 |
0.073 |
3.45 |
3.52 |
1.732 |
1.794 |
1.750 |
1.807 |
1.762 |
1.829 |
Tables of Gemstone
Identification, Roger Dedeyne, Ivo Quintens, 2007
|
|
Piemontite
|
1.732 |
1.829 |
0.025 |
0.073 |
3.45 |
3.52 |
|
|
|
|
|
|
Gemology Tools Professional 2010
|
|
Piemontite
|
1.73 |
1.83 |
0.04 |
0.098 |
3.39 |
3.55 |
|
|
|
|
|
|
Gemmo.eu 2015
|
CAUSE OF COLOUR
|
Stone |
colour |
cause of
colour |
reference |
|
Piemontite
|
purplish
red |
Mn³+ in octahedral
coordination |
Gems & Gemology Summer
1988 |
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA
(%)