|
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 |
|
Siderite |
1.6 |
|
|
|
3.9 |
3.9 |
dark brown |
Brazil |
high birefringence (spot reading) |
|
|
|
|
|
|
|
Gems & Gemology 1970 summer, p182 |
|
Siderite |
1.61 |
|
|
|
3.78 |
3.78 |
light brown |
|
0.5ct |
|
|
|
|
480nm line |
|
|
ACAM lab 4738 |
|
Siderite |
1.63 |
|
|
|
3.98 |
3.98 |
dark greenish yellow |
Covilha, Castelo Branco, Portugal |
2.65ct, transparent |
|
|
|
|
broad absorption between 450-465, 485-495, 515-530; line at 475nm |
inert |
inert |
GIA Gem Database 35505 |
|
Siderite |
1.665 |
|
|
|
3.94 |
3.94 |
|
Portugal |
2.00ct |
|
|
|
|
line at 475nm, bands at 450-460, 485-500 and 510-530nm |
inert |
inert |
GIA Gem Database 35506 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
ne
min |
ne
max |
no
min |
no
max |
Reference |
|
Siderite |
1.592 |
1.875 |
0.224 |
0.242 |
3.7 |
3.96 |
1.592 |
1.633 |
1.816 |
1.875 |
http://www.geminterest.com |
|
Siderite |
1.592 |
1.875 |
0.24 |
0.242 |
3.83 |
3.96 |
1.592 |
1.633 |
1.816 |
1.875 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
|
Siderite |
1.61 |
1.876 |
0.235 |
0.245 |
3.8 |
3.97 |
|
|
|
|
Gemmo.eu
|
|
Siderite |
1.633 |
1.875 |
0.242 |
0.242 |
3.89 |
3.89 |
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
|
Siderite |
1.633 |
1.875 |
0.24 |
0.242 |
3.83 |
3.96 |
1.633 |
1.633 |
1.873 |
1.875 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Siderite |
1.633 |
1.875 |
0.24 |
0.24 |
3.83 |
3.89 |
1.633 |
1.635 |
1.873 |
1.875 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Siderite |
1.633 |
1.873 |
0.24 |
0.24 |
3.83 |
3.96 |
|
|
|
|
http://www.gemmology.be |
|
Siderite |
1.633 |
1.873 |
0.24 |
0.24 |
3.83 |
3.88 |
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
|
Siderite |
1.633 |
1.873 |
0.24 |
0.24 |
3.83 |
3.96 |
1.633 |
1.633 |
1.873 |
1.873 |
Joel Arem, Color Encyclopedia of Gemstones,
1987 |
|
Siderite |
1.633 |
1.691 |
0.24 |
0.24 |
3.8 |
3.8 |
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972 |
|
Siderite |
1.633 |
1.873 |
0.24 |
0.24 |
3.83 |
3.88 |
|
|
|
|
Gems, R Webster, 5th edition 1994 |
|
Siderite |
1.633 |
1.873 |
0.24 |
0.24 |
3.83 |
3.96 |
|
|
|
|
Gemology Tools Professional 2010 |
CAUSE OF
COLOUR
MINERAL
INCLUSIONS
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Siderite |
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
(%)