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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Locality

Info

nx min

nx max

ny min

ny max

nz min

nz max

Spectrum

UVS

UVL

Reference

Leadhillite

1.87

2.01

 

 

6.53

6.53

colourless, transparent

 

1ea, faceted

 

 

 

 

 

 

 

very weak violet

very weak violet

Gems & Gemology 2003 fall p 216

Leadhillite

 

 

 

 

6.55

6.55

colourless

Tsumeb, Namibia

3.51ct, biaxial -

 

 

 

 

 

 

 

inert

inert

GIA Gem Database  35579

 

TABLES

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)