|
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 |
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 |
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 |
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 |
CAUSE OF
COLOUR
MINERAL
INCLUSIONS
Inclusion |
Stone |
Reference |
cristobaliet |
Bytownite |
E.J. Gübelin and J.I. Koivula, Photoatlas of
inclusions in Gemstones, volume 2 (2005) |
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
Bytownite |
|
|
Oregon |
USA |
Gemmologie 4 Dec 2001 p186 |
CHEMICAL DATA