|
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 |
|
Covellite |
1.45 |
1.45 |
|
|
4.6 |
4.6 |
very dark indigo
blue |
|
cabochon
19.66-23.64ct |
|
|
|
|
|
|
|
Gems & Gemology 1989 spring
p35-36 |
TABLES
|
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
|
Covellite |
|
|
|
|
4.6 |
4.8 |
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972
|
|
Covellite |
1.45 |
1.46 |
|
|
4.68 |
4.68 |
|
|
|
|
http://www.gemmology.be
|
|
Covellite |
1.45 |
1.45 |
|
|
4.68 |
4.68 |
|
|
|
|
http://www.geminterest.com
|
|
Covellite |
1.45 |
1.45 |
|
|
4.68 |
4.68 |
|
|
|
|
Joel Arem, Color Encyclopedia of Gemstones,
1987
|
|
Covellite |
1.45 |
2.62 |
1.17 |
1.17 |
4.6 |
4.76 |
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR
|
Stone |
Colour |
Cause of
colour |
Reference |
|
Covellite |
blue and
orange |
band
theory |
Gems & Gemology Summer
1988 |
MINERAL INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
pyrite |
Covellite |
Gems & gemology 1989 Spring p
35-36 |
|
chalcopyrite |
Covellite |
Gems & gemology 1989 Spring p
35-36 |
LOCALITIES
CHEMICAL DATA