|
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 |
|
Hibonite |
1.788 |
|
|
|
3.82 |
3.82 |
yellow-brown |
Myanmar |
0.45 and 0.50 ct |
1.788 |
1.792 |
|
|
|
inert |
inert |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2013 62/1-2, Jun, p25-29 |
|
Hibonite |
1.79 |
1.81 |
0.02 |
0.02 |
3.84 |
3.84 |
orangy brown |
Myanmar |
0.39 ct |
|
|
|
|
|
inert |
inert |
Gems & Gemology 2010 summer,
p135-138 |
|
Hibonite |
1.79 |
|
|
|
3.8 |
3.8 |
orangy brown |
|
|
|
|
|
|
|
|
|
Gems & Gemology 2012 Summer, p136 |
|
Hibonite |
1.79 |
1.81 |
|
|
3.81 |
3.81 |
very dark brown, opaque |
|
134.43ct, spot RI |
|
|
|
|
|
inert |
inert |
Gems & Gemology 2015 Fall, p314 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
ne
min |
ne
max |
no
min |
no
max |
Reference |
|
Hibonite |
1.79 |
1.81 |
0.015 |
0.02 |
3.79 |
3.85 |
|
|
|
|
Gemmo.eu 2013 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Hibonite |
blue |
Ti3+ - Ti4+ interactions |
http://minerals.caltech.edu |