|
INVESTIGATIONS
|
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
Colour |
Location |
Info |
ne min |
ne max |
no min |
no max |
Spectrum |
UVS |
UVL |
Reference |
|
Afghanite |
1.52 |
1.52 |
|
|
2.52 |
2.56 |
|
|
cabochons 2.87 to 7.25 ct, spot RI |
|
|
|
|
|
|
|
Gems & Gemology 2003 Winter, p326 |
|
Afghanite |
1.522 |
1.53 |
0.008 |
0.008 |
2.52 |
2.52 |
blue |
|
1.91ct |
|
|
|
|
|
|
bright orange |
Gems & Gemology 2018 Summer, p206 |
|
Afghanite |
1.523 |
1.529 |
0.006 |
0.006 |
2.49 |
2.5 |
|
|
|
|
|
|
|
|
|
orange |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2016 Jun, p52-56 |
|
Afghanite |
1.53 |
1.538 |
0.008 |
0.008 |
2.51 |
2.54 |
blue |
Badakhstan, Afghanistan |
|
|
|
|
|
weak absorption band at 590nm |
inert to weak red |
inert |
Gems & Gemology 2008 spring p79 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
ne
min |
ne
max |
no
min |
no
max |
Reference |
|
Afghanite |
1.52 |
1.53 |
0.005 |
0.008 |
2.5 |
2.65 |
|
|
|
|
Gemmo.eu 2013 |
|
Afghanite |
1.522 |
1.533 |
0.006 |
0.006 |
2.55 |
2.65 |
1.528 |
1.533 |
1.522 |
1.528 |
http://www.geminterest.com |
|
Afghanite |
1.523 |
1.538 |
0.006 |
0.008 |
2.51 |
2.65 |
1.529 |
1.538 |
1.523 |
1.530 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
CAUSE OF
COLOUR
|
Stone |
colour |
cause
of colour |
reference |
|
Afghanite |
blue |
SO³- |
http://www.dgemg.com/newsletter/gemmologie-aktuell/300-afghanit.html |
MINERAL
INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
calcite |
Afghanite |
E.J. Gübelin and J.I. Koivula, Photoatlas of
inclusions in Gemstones, volume 2 (2005) |
|
diopside |
Afghanite |
Gems & Gemology 2008 spring p79 |
|
lazurite |
Afghanite |
E.J. Gübelin and J.I. Koivula, Photoatlas of
inclusions in Gemstones, volume 2 (2005) |
|
psilomelan |
Afghanite |
Gemmologie, Jun 2016, p 55 |
|
pyrite |
Afghanite |
http://www.geminterest.com |
CHEMICAL DATA
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
FeO |
CaO |
Na2O |
K2O |
Cl |
SrO |
BaO |
SO3 |
|
|
Afghanite |
transparent blue |
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft, Jun 2016, p55 |
32.33 |
26.56 |
0.02 |
0.01 |
12.16 |
13.52 |
1.21 |
4.23 |
0.26 |
0.16 |
8.14 |
|
Afghanite |
translucent blue |
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft, Jun 2016, p55 |
31.7 |
26.72 |
0.02 |
0.02 |
11.77 |
13.3 |
1.99 |
4.95 |
|
|
6.65 |