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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

piemontite

1.73

 

 

 

 

 

pink

Shadow Lake area, California, USA

0.24ct

 

 

 

 

 

 

 

 

 

Gems & Jewellery 2009 october, Volume 18 / No. 4

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

nx min

 nx max

ny min

ny max

nz min

nz max

Reference

Piemontite

1.732

1.832

0.025

0.073

3.2

3.52

1.732

1.794

 

 

1.762

1.832

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

Piemontite

1.732

1.829

0.025

0.073

4.03

4.03

1.732

1.794

1.750

1.807

1.762

1.829

http://www.geminterest.com 

Piemontite

1.732

1.829

0.025

0.073

3.45

3.52

1.732

1.794

1.750

1.807

1.762

1.829

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

Piemontite

1.732

1.829

0.025

0.073

3.45

3.52

 

 

 

 

 

 

Gemology Tools Professional 2010

Piemontite

1.73

1.83

0.04

0.098

3.39

3.55

 

 

 

 

 

 

Gemmo.eu 2015

 

CAUSE OF COLOUR

Stone

colour

cause of colour

reference

Piemontite

purplish red

Mn≥+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)