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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Sphalerite

 

 

4.05

4.05

greenish yellow

Spain

2.35 ct

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2013 62/1-2, Jun, p39

Sphalerite

 

 

4.08

4.08

yellow to orange

 

cabochons (18 and 20 mm), cat’s-eye and star effect are due to scratches, IR OTL

no

inert

inert

Gems & Gemology 2009 winter, p303-304

Sphalerite

2.27

2.27

4.09

4.09

yellow-brown

 

9ct

 

inert

inert

ACAM Lab  2239

Sphalerite

2.07

2.07

4.1

4.1

yellow

Sri Lanka

1.05ct, RI Jemeter

 

inert

inert

ACAM labo  2284

Sphalerite

 

 

4.1

4.1

medium bluish green

Mont St.-Hilaire, Canada

3.98ct

weak, moderately broad bands at about 480, 500, and 560 nm and a stronger one at 590 nm

inert

weak orange

Gems & Gemology 1995 Spring, p65

Sphalerite

 

 

4.1

4.1

brown-orange

Spain

2.64ct

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2013 62/1-2, Jun, p39

Sphalerite

 

 

4.11

4.11

yellow

Las Manforas Mine, Camaleno, Cantabria, Spain

11.05ct, transparent

broad absorption below 440nm and above 670nm

inert

inert

GIA Gem Database  34117

Sphalerite

 

 

4.11

4.11

orange

Las Manforas Mine, Camaleno, Cantabria, Spain

20.88ct, transparent

broad absorption below 4500nm

inert

inert

GIA Gem Database  34114

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Sphalerite synthetic

2.25

2.35

4.03

4.06

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Sphalerite synthetic

2.25

2.35

4.03

4.06

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

Sphalerite synthetic

2.25

2.35

4.03

4.09

Gemmological Tables, Ulrich Henn, 2004 

Sphalerite synthetic

2.295

2.305

4.03

4.06

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

Sphalerite synthetic

2.3

2.3

4.06

4.06

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Sphalerite

2.368

2.371

4.08

4.1

John Sinkakas, Gemstone and mineral data book,1972 

Sphalerite

2.368

2.43

3.9

4.2

http://www.geminterest.com 

Sphalerite

2.368

2.371

4.08

4.1

Gems, R Webster, 5th edition 1994 

Sphalerite

2.369

2.371

3.99

4.1

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

Sphalerite

2.369

2.369

4.01

4.1

Gemmological Tables, Ulrich Henn, 2004 

Sphalerite

2.369

2.5

3.9

4.1

Gemology Tools Professional 2010

Sphalerite

2.369

2.431

3.9

4.12

Gemmo.eu 

Sphalerite

2.37

2.37

4.05

4.1

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Sphalerite

2.37

2.43

3.9

4.1

http://www.gemmology.be 

Sphalerite

2.37

2.37

4.09

4.09

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Sphalerite

2.37

2.43

3.9

4.1

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Sphalerite

2.37

2.43

3.9

4.1

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Sphalerite

yellow to black

iron -> sulfur charge transfer

Gems & Gemology Summer 1988

Sphalerite

green

Co²+ in tetrahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Sphalerite

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry)

Mont Saint-Hilaire, Rouville County

Quebec

Canada

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1994, Dez, p137

Sphalerite

Las Manforas Mine, Aliva

Picos de Europa

Cantabria

Spain

http://gem-sphalerite.com

Sphalerite

Iron Cap Mine, Landsman Camp, Aravaipa District, Pinaleno Mts

Graham County

Arizona

USA

http://www.classicgems.net/

Sphalerite

Thomasville Crushed Stone Quarry, Thomasville

York County

Pennsylvania

USA

Gems & Gemology 1992 Fall p204

 

CHEMICAL DATA (%)