|
INVESTIGATIONS
|
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
|
Copal |
1.53 |
1.53 |
1.05 |
1.05 |
|
|
5.56ct, cabochon, spot
RI |
|
greenish |
|
ACAM lab
1930 |
|
Copal |
1.54 |
1.54 |
1.03 |
1.095 |
colourless,
red-brown |
New
Zealand |
transparent to opaque, Kauri
copal; alchol solubility test gives better results than
ether |
|
inert to light blue , white and
mustard |
stronger than
UVS |
The Journal of Gemmology 1997
Vol 25, N°6,
p408-416 |
TABLES
|
Stone |
RI min |
RI max |
Dens min |
Dens max |
Reference |
|
Copal |
1.52 |
1.54 |
1.04 |
1.1 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
|
Copal |
1.53 |
1.54 |
2.03 |
1.1 |
http://www.geminterest.com
|
|
Copal |
1.53 |
1.54 |
1.03 |
1.1 |
Gemology Tools Professional 2010
|
|
Copal |
1.535 |
1.545 |
1.03 |
1.12 |
www.gemmo.eu
|
|
Copal |
1.539 |
1.545 |
1.05 |
1.1 |
Gemmological Tables, Ulrich Henn, 2004
|
|
Copal |
1.539 |
1.545 |
1 |
1.1 |
Tables of Gemstone
Identification, Roger Dedeyne, Ivo Quintens, 2007
|
|
Copal |
1.54 |
1.542 |
1.03 |
1.1 |
http://www.gemmology.be
|
|
Copal |
1.54 |
1.54 |
1.03 |
1.1 |
Gems, R Webster, 5th edition
1994
|
CAUSE OF COLOUR
|
Stone |
Colour |
Cause of
colour |
Reference |
|
Copal |
yellow,
brown |
charge transfer processes in
large organic molecules |
Gems & Gemology Summer
1988 |
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA