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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

Hypersthene

1.67

1.68

0.01

0.01

3.34

3.34

dark orangy brown

Mysore, Karnataka, India

6.47ct, biaxial -

 

 

 

 

 

 

broad absorption below 420 and between 550-555, lines at 435, 451, 460, 473, 485, 508nm

 

 

GIA Gem Database  34034

Hypersthene

1.69

1.703

0.013

0.013

3.44

3.44

brown, opaque

Sri Lanka

optical effect: golden-brown wavy zones due to lamellar twinning; 15.29 % FeO

1.690

1.690

1.700

1.700

1.703

1.703

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2010 Jun, p51-54

 

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

Hypersthene

1.67

1.695

0.01

0.02

3.3

3.5

1.670

1.680

 

 

1.675

1.695

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Hypersthene

1.67

1.73

0.01

0.02

3.4

3.5

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Hypersthene

1.673

1.731

0.01

0.016

3.4

3.5

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Hypersthene

1.685

1.772

0.015

0.017

3.43

3.9

1.685

1.755

 

 

1.703

1.772

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

Hypersthene

1.686

1.772

0.015

0.017

3.43

3.9

1.686

1.755

 

 

1.703

1.772

http://www.geminterest.com 

Hypersthene

1.686

1.772

0.01

0.016

3.4

3.5

1.686

1.755

 

 

1.703

1.772

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

Hypersthene

1.686

1.725

0.013

0.015

3.44

3.58

1.686

1.710

1.695

1.722

1.699

1.725

Gemmological Tables, Ulrich Henn, 2004 

Hypersthene

1.686

1.772

0.016

0.017

3.43

3.9

 

 

 

 

 

 

http://www.gemmology.be 

Hypersthene

1.686

1.772

0.017

0.017

3.43

3.9

1.686

1.755

 

 

1.703

1.772

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Hypersthene

1.686

1.772

0.008

0.011

3.43

3.9

 

 

 

 

 

 

Gemology Tools Professional 2010

Hypersthene

 

 

0.012

0.015

3.3

3.4

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

hematite

Hypersthene

Joel Arem, Color Encyclopedia of Gemstones, 1987

goethite

Hypersthene

Joel Arem, Color Encyclopedia of Gemstones, 1987

 

LOCALITIES

 

CHEMICAL DATA