|
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 |
Coral imitation -
Gilson |
1.55 |
1.55 |
|
|
2.44 |
2.44 |
almost white,
red-brown, |
|
hardness 3.5, structure brecciated, toughness
significantly less than coral, coloured effervescence by HCl, coloured
streak |
|
|
|
|
|
|
|
inert to strong purplish
red |
inert to strong purplish
red |
Gems & Gemology 1979 summer
p179-185 |
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 |
Coral imitation -
Gilson |
1.486 |
1.658 |
0.172 |
0.172 |
2.44 |
2.46 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine, Birgit
Günther, 2008
|
Coral imitation -
Gilson |
1.55 |
1.58 |
|
|
2.24 |
2.65 |
|
|
|
|
|
|
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Coral imitation -
Gilson |
1.55 |
1.55 |
|
|
2.44 |
2.44 |
|
|
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR
CHEMICAL DATA