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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Location

Info

ne min

ne max

no min

no max

Spectrum

UVS

UVL

Reference

Dioptase

1.652

1.705

0.053

0.053

3.28

3.28

dark bluish green

Mozambique

 

 

 

 

 

braod band around 550nm, strong absorption in the violet-blue region

inert

inert

The Australian Gemmologist 2012 Vol 24, Number 9, p215-219

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Dioptase

1.644

1.709

0.053

0.053

3.3

3.3

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Dioptase

1.644

1.709

0.051

0.053

3.25

3.35

1.697

1.709

1.644

1.658

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Dioptase

1.644

1.709

0.051

0.053

3.25

3.35

1.697

1.709

1.644

1.658

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

Dioptase

1.644

1.709

0.051

0.053

3.28

3.35

1.697

1.709

1.644

1.658

Gemmological Tables, Ulrich Henn, 2004 

Dioptase

1.644

1.709

0.053

0.053

3.28

3.35

 

 

 

 

http://www.gemmology.be 

Dioptase

1.644

1.72

0.051

0.053

3.25

3.35

1.696

1.720

1.644

1.665

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Dioptase

1.644

1.697

0.022

0.036

3.28

3.35

1.697

1.723

1.644

1.667

http://www.geminterest.com 

Dioptase

1.644

1.709

0.053

0.053

3.28

3.35

1.697

1.709

1.644

1.658

Gems, R Webster, 5th edition 1994 

Dioptase

1.644

1.709

0.051

0.053

3.28

3.35

1.697

1.709

1.644

1.658

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

Dioptase

1.664

1.709

0.053

0.053

3.28

3.35

1.697

1.709

1.664

1.658

Joel Arem, Color Encyclopedia of Gemstones, 1987 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Dioptase

green

Cu²+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA