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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

Laurentthomasite

1.555

1.56

0.005

0.005

2.59

2.63

greenish blue

Toliara Province, Madagascar

0.98ct and 1.67ct

 

 

 

 

 

inert

inert

The Journal of Gemmology 2020 Vol 37 (2), p136-139

 

TABLES

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)