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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

Spurrite

1.64

1.68

0.04

0.04

2.85

2.96

purple

 

beads, spot RI

 

 

 

 

 

 

no features

inert

inert

Gems & Gemology 2004 Spring, p63-64

Spurrite

1.64

1.68

 

 

3

3

medium to dark purple

Mexico

shade RI

 

 

 

 

 

 

 

 

 

Gems & Gemology 1986 Summer, p114

Spurrite

1.67

1.67

 

 

3

3

greyish lilac purple

Tres Hermanas Mts, Luna County, New Mexico, USA

IR indistinct (bright line technique), translucent, 3.14 and 5.73ct, chelsea filter: light pinkish red

 

 

 

 

 

 

no features

inert

inert

The Journal of Gemmology 2016 Vol 35, No. 1, p 21-22

 

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

Spurrite

1.636

1.682

0.037

0.041

2.89

3.05

 

 

 

 

 

 

Gemmo.eu 2013

Spurrite

1.637

1.681

0.039

0.04

3

3.01

1.637

1.641

 

 

1.676

1.681

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

Spurrite

1.637

1.681

0.039

0.04

3

3

1.637

1.641

1.672

1.674

1.676

1.681

Gemmological Tables, Ulrich Henn, 2004 

Spurrite

1.637

1.676

0.039

0.039

 

 

1.637

1.637

1.672

1.672

1.676

1.676

Gems, R Webster, 5th edition 1994 

Spurrite

1.637

1.681

0.039

0.04

3.01

3.01

1.637

1.641

 

 

1.676

1.681

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Spurrite

1.637

1.682

0.039

0.04

3

3.02

1.637

1.641

1.672

1.674

1.676

1.682

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

Spurrite

1.64

1.679

0.039

0.039

3

3

 

 

 

 

 

 

http://www.gemmology.be 

Spurrite

1.64

1.679

0.039

0.039

3

3

1.640

1.640

1.674

1.674

1.679

1.679

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Spurrite

1.64

1.679

0.039

0.039

3

3

1.640

1.640

1.674

1.674

1.679

1.679

http://www.geminterest.com 

Spurrite

1.64

1.679

0.039

0.039

3

3

 

 

 

 

 

 

Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Spurrite

Tres Hermanas district

Luna County

New Mexico

USA

The Journal of Gemmology 2016, Vol 35, No. 1, p 21-22







 

CHEMICAL DATA (%)