|
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 |
Howlite |
1.583 |
1.605 |
0.022 |
0.022 |
2.45 |
2.58 |
1.583 |
1.586 |
1.596 |
1.598 |
1.605 |
1.605 |
Joel Arem, Color Encyclopedia of Gemstones,
1987
|
Howlite |
1.583 |
1.61 |
0.019 |
0.022 |
2.45 |
2.59 |
1.583 |
1.586 |
1.596 |
1.598 |
1.605 |
1.610 |
http://www.geminterest.com
|
Howlite |
1.583 |
1.605 |
0.19 |
0.22 |
2.45 |
2.59 |
1.583 |
1.586 |
|
|
1.605 |
1.605 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Howlite |
1.583 |
1.605 |
0.022 |
0.022 |
2.45 |
2.58 |
|
|
|
|
|
|
http://www.gemmology.be
|
Howlite |
1.583 |
1.605 |
0.019 |
0.022 |
2.45 |
2.58 |
1.583 |
1.586 |
1.596 |
1.598 |
1.605 |
1.605 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
Howlite |
1.586 |
1.605 |
0.019 |
0.019 |
2.58 |
2.58 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine, Birgit
Günther, 1981
|
Howlite |
1.586 |
1.605 |
0.019 |
0.019 |
2.58 |
2.58 |
1.586 |
1.586 |
1.598 |
1.598 |
1.605 |
1.605 |
Gemmological Tables, Ulrich Henn, 2004
|
Howlite |
1.59 |
1.59 |
|
|
2.58 |
2.58 |
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972
|
Howlite |
1.59 |
1.59 |
0.02 |
0.02 |
2.58 |
2.58 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA