|
INVESTIGATIONS
|
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
|
Barium sulfate - Artificial product
|
1.58 |
1.58 |
2.33 |
2.33 |
red (coral
imitation) |
|
hardness
2.5-3 |
|
|
|
Gems & Gemology 1990 summer, p
153-154 |
|
Barium sulfate - Artificial product
|
0 |
0 |
2.34 |
2.34 |
opaque white with black
veins |
|
1.58 ct,
howlite imitation |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2009 58/3-4/Dec,
p87-88 |
TABLES
|
Stone |
RI min |
RI max |
Dens min |
Dens max |
Reference |
|
Barium sulfate - Artificial product
|
1.5 |
1.55 |
2.26 |
2.33 |
Gemmological Tables, Ulrich Henn, 2004
|
|
Barium sulfate - Artificial product
|
1.5 |
1.55 |
2.26 |
2.33 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR