|
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 |
|
Geikielite |
|
|
|
|
4.12 |
4.12 |
black |
|
2.21 ct, cabochon with
artificial star, magnetic, 70% geikielite-30%
ilmenite |
|
|
|
|
|
|
|
Revue de
Gemmologie A.F.G. 2012 180,
p8 |
|
Geikielite |
|
|
|
|
4.2 |
4.2 |
black,
opaque |
|
strong attraction to a
neodymium magnet, ferroan geikelite |
|
|
|
|
|
|
|
Gems & Gemology 2012 spring,
p69 |
TABLES
|
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
|
Geikielite |
1.95 |
2.35 |
0.36 |
0.37 |
4.00 |
4.00 |
1.950 |
1.980 |
2.310 |
2.350 |
Tables of Gemstone
Identification, Roger Dedeyne, Ivo Quintens, 2007
|
CAUSE OF COLOUR
MINERAL
INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)