|
INVESTIGATIONS
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
Colour |
Location |
Info |
ne min |
ne max |
no min |
no max |
Spectrum |
UVS |
UVL |
Reference |
Willemite |
1.685 |
1.715 |
0.03 |
0.03 |
4.25 |
4.25 |
light orangy yellow |
Franklin District, New Jersey, USA |
2.42ct |
|
|
|
|
lines at 428, 440, 450nm, band below 415nm |
weak green |
weak green |
GIA Gem Database 35547 |
Willemite |
1.69 |
1.722 |
0.032 |
0.032 |
4.25 |
4.25 |
orange |
Franklin District, New Jersey, USA |
8.71ct |
|
|
|
|
lines at 490, 544nm, band below 440nm |
weak green |
inert |
GIA Gem Database 35244 |
Willemite |
1.69 |
1.718 |
0.028 |
0.028 |
4.23 |
4.23 |
yellowish orange |
Tsumeb, Namibia |
4.41ct |
|
|
|
|
no features |
weak yellowish green |
weak orangy yellow |
GIA Gem Database 34742 |
Willemite |
1.695 |
1.723 |
0.028 |
0.028 |
|
|
very light yellow to slightly brown |
Franklin mining district, New Jersey, USA |
0.42ct |
|
|
|
|
|
strong yellowish-green |
inert |
www.spec4gem.info 2019 13 january |
Willemite |
1.696 |
1.724 |
0.028 |
0.028 |
4.29 |
4.29 |
orange |
Franklin District, Sussex County, New Jersey, USA |
10.15ct |
|
|
|
|
broad absorption below 425; lines at 490, 550nm |
weak green |
inert |
GIA Gem Database 34123 |
Willemite |
1.699 |
1.721 |
0.022 |
0.022 |
4.24 |
4.24 |
orangy yellow |
Franklin District, Sussex County, New Jersey, USA |
9.54ct |
|
|
|
|
broad absorption below 415; lines at 428, 440, 452, 480, 500nm |
medium green |
medium green |
GIA Gem Database 35546 |
TABLES
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
Willemite |
1.687 |
1.723 |
0.028 |
0.029 |
3.89 |
4.18 |
1.716 |
1.723 |
1.687 |
1.695 |
Gemmological Tables, Ulrich Henn,
2004 |
Willemite |
1.688 |
1.726 |
0.021 |
0.031 |
3.88 |
4.27 |
|
|
|
|
Gemmo.eu 2019 |
Willemite |
1.69 |
1.723 |
0.028 |
0.033 |
3.89 |
4.2 |
1.719 |
1.723 |
1.690 |
1.691 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Willemite |
1.69 |
1.72 |
0.03 |
0.03 |
3.89 |
4.18 |
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Willemite |
1.69 |
1.72 |
0.028 |
0.028 |
3.89 |
4.18 |
|
|
|
|
Gems, R Webster, 5th edition 1994 |
Willemite |
1.69 |
1.723 |
0.028 |
0.033 |
3.89 |
4.18 |
1.719 |
1.723 |
1.690 |
1.691 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
Willemite |
1.69 |
1.715 |
0.01 |
0.033 |
3.89 |
4.18 |
1.715 |
1.730 |
1.690 |
1.720 |
Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Willemite |
1.691 |
1.719 |
0.028 |
0.028 |
3.89 |
4.1 |
1.719 |
1.719 |
1.691 |
1.691 |
Joel Arem, Color Encyclopedia of Gemstones, 1987 |
Willemite |
1.691 |
1.719 |
0.028 |
0.028 |
3.89 |
4.1 |
|
|
|
|
http://www.gemmology.be |
Willemite |
1.691 |
1.72 |
0.018 |
0.028 |
3.9 |
4.18 |
|
|
|
|
John Sinkakas, Gemstone and mineral data book,1972 |
Willemite |
1.691 |
1.719 |
0.028 |
0.028 |
3.89 |
4.18 |
1.719 |
1.719 |
1.691 |
1.691 |
http://www.geminterest.com |
Willemite |
1.691 |
1.719 |
0.028 |
0.028 |
4 |
4.2 |
|
|
|
|
Gemology Tools Professional 2010 |
Willemite |
1.691 |
1.724 |
0.028 |
0.028 |
3.89 |
4.1 |
1.719 |
1.724 |
1.691 |
1.695 |
Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification
(2006), 873pp |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Willemite |
yellow, yellow-green |
Mn²+ in tetrahedral coordination |
Gems & Gemology Summer 1988 |
MINERAL INCLUSIONS
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
Willemite |
Poudrette quarry (Demix quarry; Uni-Mix quarry;
Desourdy quarry) |
Mont Saint-Hilaire, Rouville County |
Quebec |
Canada |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1994, Dez, p137 |
CHEMICAL DATA
(%)