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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

wurtzite

 

 

 

 

3.78

3.85

orange-brown

Merelani, Tanzania

0.30 to 1.74 ct

 

 

 

 

 

inert

inert

Gems & Gemology 2013 Winter, p261

wurtzite

2.36

2.36

 

 

3.81

3.81

reddish brown

Merelani, Tanzania

0.91ct and 0.83ct

 

 

 

 

 

 

 

The Journal of Gemmology 2015 Vol 38, No 8, p669-671

wurtzite

 

 

 

 

3.96

3.96

brownish red

 

3.97ct

 

 

 

 

 

inert

inert

Gems & Gemology 2014 Summer, p156

synthetic wurtzite

2.3

2.3

 

 

4.06

4.06

bright green (Co), yellow (Ni), blue (Cu)

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1978 N°1, p30

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Synthetic wurtzite

2.356

2.378

0.022

0.022

4.03

4.03

2.378

2.378

2.356

2.356

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Synthetic wurtzite

2.356

2.378

0.022

0.022

4.03

4.06

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Synthetic wurtzite

2.356

2.378

0.022

0.022

4.03

4.09

2.378

2.378

2.356

2.356

Gemmological Tables, Ulrich Henn, 2004 

Synthetic wurtzite

2.356

2.378

0.022

0.022

3.98

4.06

 

 

 

 

Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 

Synthetic wurtzite

2.378

2.356

0.022

0.022

4.03

4.06

2.378

2.378

2.356

2.356

Gemme, Dati per l'identificazione, P. De Stefano et al, 1993 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Wurtziet

Merelani Hills (Mererani)

Lelatema Mts

Arusha Region

Tanzania

Gems & Gemology 2013 Winter, p261-262







 

CHEMICAL DATA