|
INVESTIGATIONS
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
Jet |
1.64 |
1.64 |
1.182 |
1.182 |
|
|
hot needle: burning
coal |
|
|
|
The Australian Gemmologist 1987 Feb
p195 |
Jet |
|
|
1.1 |
1.22 |
|
Eastern
Siberia |
harness
2.5-3 |
|
|
|
The Journal of Gemmology 1995 Vol 24, N°5,
p349-353 |
TABLES
Stone |
RI min |
RI max |
Dens min |
Dens max |
Reference |
Jet |
1.64 |
1.68 |
1.1 |
1.38 |
John Sinkakas, Gemstone and mineral data
book,1972
|
Jet |
1.64 |
1.68 |
1.3 |
1.34 |
Bestimmungstabellen für Edelsteine, Birgit
Günther, 1981
|
Jet |
1.64 |
1.7 |
1.19 |
1.4 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Jet |
1.64 |
1.68 |
1.1 |
1.4 |
Gems, R Webster, 5th edition 1994
|
Jet |
1.66 |
1.66 |
1.19 |
1.35 |
http://www.geminterest.com
|
Jet |
1.66 |
1.66 |
1.3 |
1.35 |
Gemmological Tables, Ulrich Henn, 2004
|
Jet |
1.66 |
1.66 |
1.19 |
1.35 |
http://www.gemmology.be
|
Jet |
1.66 |
1.66 |
1.19 |
1.35 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
Jet |
|
|
1.19 |
1.35 |
Joel Arem, Color Encyclopedia of Gemstones,
1987
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
STONE |
LOCALITIES |
REFERENCE | |||
Jet |
|
Whitby |
North
Yorkshire |
Engeland |
Kunz,1892: Gems & Precious Stones of N.
America, p.273. |
Jet |
Matagan |
Irkutsk |
Eastern
Siberia |
Rusland |
Gems & Gemology 1997 spring
p62 |
CHEMICAL DATA