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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

Nepheline

1.531

1.539

0.003

0.004

2.58

2.6

reddish-brown to bluish-green

Norway

cat's eye 12.84 and 7.13ct

1.531

1.535

1.534

1.539

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1996 Sep, p134-135

Nepheline

1.55

1.55

2.53

2.53

bronze, opaque

Korea

cat's eye (fine parallel tube-like inclusions)

inert

inert

The Australian Gemmologist 1988 August, p428

 

TABLES

Stone	RI min	RI max	Biref min	Biref max	Dens min	Dens max	ne min	ne max	no min	no max	Reference
Nepheline	1.526	1.546	0.004	0.004	2.55	2.66	1.526	1.542	1.529	1.546	http://www.geminterest.com
Nepheline	1.526	1.549	0.004	0.01	2.55	2.66	1.526	1.542	1.529	1.549	Gemme, Dati per l'identificazione, P. De Stefano et al, 1993
Nepheline	1.526	1.546	0.004	0.004	2.55	2.66					http://www.gemmology.be
Nepheline	1.526	1.546	0.004	0.004	2.55	2.66	1.526	1.542	1.529	1.546	Joel Arem, Color Encyclopedia of Gemstones, 1987
Nepheline	1.526	1.549	0.004	0.005	2.55	2.66	1.526	1.544	1.529	1.549	Tables of Gemstone Identification, Roger Dedeyn, Ivo Quintens, 2007
Nepheline	1.529	1.547	0.003	0.005	2.55	2.65	1.529	1.542	1.532	1.547	Gemmological Tables, Ulrich Henn, 2004
Nepheline	1.532	1.549	0.004	0.005	2.55	2.65					Bestimmungstabellen für Edelsteine, Birgit Günther, 1981
Nepheline	1.54	1.54	0.004	0.004	2.55	2.65					Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975
Nepheline	1.54	1.54	0.004	0.004	2.55	2.65					Gems, R Webster, 5th edition 1994

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE	LOCALITIES				REFERENCE
Nepheline	Svensken, Tvedalen	Larvik	Vestfold	Norway	Gemmologie, Sep 1996, p135
Nepheline	Stalakar, Tjolling	Larvik	Vestfold	Norway	Gemmologie, Sep 1996,p134

 

CHEMICAL DATA (%)