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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

Crocoite

2.29

2.66

0.35

0.35

5.9

6.1

 

 

transparent, translucent, 3.94 ct and 1.14 ct

2.29

2.31

2.36

2.37

2.66

2.66

 

inert

inert

The Australian Gemmologist 2004 Vol 22,N°2, p59-63

Crocoite

 

 

 

 

6.05

6.05

orange

 

 

 

 

 

 

 

 

 

 

 

ACAM labo 

Crocoite

 

 

 

 

6.2

6.2

 

Dundas, Tasmania, Australia

5.40ct, translucent

 

 

 

 

 

 

broad absorption below 560nm

inert

inert

GIA Gem Database  35441

Crocoite

 

 

 

 

6.28

6.28

red-orange

Dundas, Tasmania, Australia

4.73ct, transparent

 

 

 

 

 

 

broad absorption below 560nm

inert

inert

GIA Gem Database  35440

 

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

Crocoite

2.29

2.66

0.27

0.35

5.9

6.1

 

 

 

 

 

 

http://www.gemmology.be 

Crocoite

2.29

2.66

0.27

0.27

5.9

6.1

2.290

2.310

2.360

2.360

2.660

2.660

http://www.geminterest.com 

Crocoite

2.29

2.66

0.27

0.27

5.9

6.1

2.290

2.310

2.360

2.360

2.660

2.660

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Crocoite

2.29

2.66

0.27

0.27

5.9

6.1

2.290

2.310

 

 

2.660

2.660

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

Crocoite

2.31

2.66

0.35

0.35

5.96

6.02

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Crocoite

2.31

2.66

0.35

0.35

5.99

6.01

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Crocoite

2.31

2.66

0.35

0.35

5.9

6.1

2.310

2.310

2.370

2.370

2.660

2.660

Gemmological Tables, Ulrich Henn, 2004 

Crocoite

2.31

2.66

0.35

0.35

5.9

6.1

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Crocoite

2.31

2.66

0.35

0.35

5.9

6.1

2.310

2.310

2.370

2.370

2.660

2.660

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Crocoite

yellow to red

O²-->Cr6+ charge transfer

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Crocoiet

West Comet Mine

Dundas

Tasmania

Australië

Lapis 2/1989

 

CHEMICAL DATA