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

Zn-Staurolite

1,721

1,731

0,01

0,01

3,79

3,79

red-brown

Brazil

Gems & Gemology 1970 fall, p227

Staurolite

1,732

1,744

0,012

0,012

3,74

3,74

dark red, translucent

Brazil

0.28ct

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p121-122

Staurolite

1,734

1,748

0,014

0,014

reddish-brown

transparent

lines at 526, 550 and 575nm

Gems & Gemology 1963 Spring, p19

Staurolite

1,736

1,746

0,01

0,01

3,78

3,78

reddish brown

1,66ct

1,736

1,736

1,740

1,740

1,746

1,746

The Australian Gemmologist 2022 Vol28, Nb1, p14

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

Staurolite

1.739

1.762

0.012

0.012

3.4

3.8

John Sinkakas, Gemstone and mineral data book,1972 

Staurolite

1.736

1.762

0.01

0.015

3.65

3.77

1.736

1.747

1.746

1.762

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Staurolite

1.739

1.762

0.013

0.015

3.65

3.77

1.739

1.747

1.745

1.753

1.752

1.762

Gemmological Tables, Ulrich Henn, 2004 

Staurolite

1.736

1.762

0.01

0.015

3.65

3.83

1.736

1.747

1.746

1.762

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

Staurolite

1.739

1.761

0.011

0.015

3.65

3.83

http://www.gemmology.be 

Staurolite

1.739

1.762

0.011

0.015

3.62

3.78

1.739

1.747

1.750

1.762

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Staurolite

1.739

1.761

0.011

0.015

3.65

3.83

1.739

1.747

1.745

1.753

1.752

1.761

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Staurolite

1.721

1.731

0.01

0.01

3.5

3.83

1.721

1.721

1.731

1.731

http://www.geminterest.com 

Staurolite

1.736

1.762

0.01

0.015

3.5

3.83

1.736

1.747

1.744

1.754

1.750

1.762

http://www.geminterest.com 

Staurolite

1.739

1.762

0.011

0.015

3.65

3.78

1.739

1.747

1.744

1.754

1.750

1.762

Gems, R Webster, 5th edition 1994 

Staurolite

1.739

1.761

0.011

0.015

3.65

3.83

1.739

1.747

1.745

1.753

1.752

1.761

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

Stone

Colour

Cause of colour

Reference

Staurolite

blue

Co²+ in tetrahedral coordination

Gems & Gemology Summer 1988

Staurolite

brown

Fe²+ in tetrahedral coordination

Gems & Gemology Summer 1988