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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