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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

Prosopite

1.5

1.5

 

 

2.69

2.85

blue

Santa Rosa, Zacatecas, Mexico

RI spot

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1976 N4,p

Prosopite

1.51

1.51

 

 

2.65

2.65

light blue

 

cabochon

 

 

 

 

 

 

none

 

 

Gems & Gemology 1997 spring, p93

Prosopite

1.51

1.51

 

 

2.65

2.65

turquoise blue

 

cabochon, 9.9ct

 

 

 

 

 

 

 

 

 

Gems & Gemology 1975 Fall, p93

 

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

Prosopite

1.499

1.511

0.008

0.01

2.69

2.9

 

 

 

 

 

 

Gemmo.eu 2017

Prosopite

1.5

1.51

0.009

0.009

2.88

2.85

1.500

1.501

1.503

1.509

1.509

1.510

http://www.geminterest.com 

Prosopite

1.5

1.51

0.009

0.009

2.88

2.89

1.50

1.50

1.50

1.51

1.51

1.51

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp 

Prosopite

1.501

1.51

0.009

0.009

2.69

2.9

1.501

1.501

1.503

1.503

1.510

1.510

Gemmological Tables, Ulrich Henn, 2004 

Prosopite

1.501

1.51

0.009

0.009

2.69

2.85

 

 

 

 

 

 

http://www.gemmology.be 

Prosopite

1.501

1.51

0.009

0.009

2.88

2.88

1.501

1.501

1.503

1.503

1.510

1.510

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Prosopite

1.501

1.51

 

 

2.88

2.88

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Prosopite

1.501

1.51

0.009

0.009

2.87

2.9

 

 

 

 

 

 

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

Prosopite

1.501

1.51

0.009

0.009

2.69

2.9

 

 

 

 

 

 

Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

Al2O3

CaO

CuO

H2O

F

Prosopite

blue

Santa Rosa, Zacatecas

Mexico

The Journal of Gemmology 1976, N4,p206

20.65

15.37

1.39

16.78

30.16