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INVESTIGATIONS

 

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

Purpurite

1.85

1.92

0.07

0.07

3.37

3.37

1.850

1.850

1.860

1.860

1.920

1.920

Gemmological Tables, Ulrich Henn, 2004 

Purpurite

1.85

1.92

0.07

0.07

3.69

3.69

 

 

 

 

 

 

http://www.gemmology.be 

Purpurite

1.85

1.92

0.07

0.07

3.69

3.69

1.850

1.850

1.860

1.860

1.920

1.920

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Purpurite

1.85

1.92

0.07

0.07

3.2

3.7

1.850

1.850

1.860

1.860

1.920

1.920

http://www.geminterest.com 

Purpurite

1.85

1.92

0.07

0.07

3.37

3.4

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Purpurite

1.85

1.92

0.07

0.07

3.6

3.69

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Purpurite

red

Mn³+  in octahedral coordination

Alain Abréal, juillet 2002

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)