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

Bytownite

1.557

1.569

0.012

0.012

2.71

2.71

pale yellow

1.81ct

1.557

1.557

1.563

1.563

1.569

1.569

no features

inert

inert

ACAM Lab  325

Bytownite

1.562

1.568

0.006

0.006

2.74

2.74

light brownish yellow

Mexico

7.81ct

no features

inert

inert

GIA Gem Database  34469

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

Bytownite

1.56

1.57

0.009

0.009

2.72

2.75

1.560

1.561

1.570

1.570

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

Bytownite

1.561

1.57

0.009

0.009

2.72

2.75

1.561

1.561

1.565

1.565

1.570

1.570

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Bytownite

1.561

1.57

0.009

0.009

2.72

2.75

http://www.gemmology.be 

Bytownite

1.561

1.582

0.007

0.011

2.72

2.75

1.561

1.573

1.565

1.580

1.570

1.582

http://www.geminterest.com 

Bytownite

1.561

1.585

0.009

0.012

2.72

2.75

1.561

1.573

1.565

1.580

1.570

1.585

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

Bytownite

1.561

1.584

0.009

0.012

2.69

2.75

Gemmo.eu 2016

Bytownite

1.564

1.576

0.009

0.01

John Sinkakas, Gemstone and mineral data book,1972 

Bytownite

1.565

1.574

0.009

0.009

2.71

2.71

1.565

1.565

1.570

1.570

1.574

1.574

Gemmological Tables, Ulrich Henn, 2004 

Bytownite

1.567

1.576

0.009

0.009

2.73

2.73

Gems, R Webster, 5th edition 1994 

Inclusion

Stone

Reference

cristobaliet

Bytownite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

STONE

LOCALITIES

REFERENCE

Bytownite

Oregon

USA

Gemmologie 4 Dec 2001 p186