|
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 |
|
Bastnäsite |
1.718 |
|
|
|
5.05 |
5.23 |
Slightly brownish orange |
Mt. Malosa, Malawi |
0.34 - 1.55 ct |
|
|
1.718 |
1.719 |
|
inert |
inert |
Gems & Gemology 2010 Spring, p42-47 |
|
Bastnäsite |
1.72 |
|
|
|
5.14 |
5.14 |
dark reddish orange |
Pakistan |
2.60ct |
|
|
|
|
many lines |
inert |
inert |
GIA Gem Database 35337 |
|
Bastnäsite |
1.72 |
|
|
|
5.09 |
5.09 |
colour changing from brownish yellow (daylight) to
orange |
Pakistan |
2.09ct |
|
|
|
|
|
inert |
inert |
Gems & Gemology 2007 p165-166 |
|
Bastnäsite |
1.72 |
|
|
|
5.21 |
5.21 |
brown-yellow |
|
0.68ct |
|
|
|
|
band at 440-450, 460-470, 480-490,
520-540, 600-630nm |
inert |
inert |
ACAM Lab
322 |
|
Bastnäsite |
1.722 |
|
|
|
5.16 |
5.16 |
|
|
|
|
|
|
|
rare earth |
inert |
inert |
Gems & Gemology 1999 summer p136 |
|
Bastnäsite |
1.722 |
|
|
|
|
|
yellowish brown to orangy brown |
Peshawar District, Pakistan |
3.19 cts |
|
|
|
|
rare earth |
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2003 Dec, p126 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
ne
min |
ne
max |
no
min |
no
max |
Reference |
|
Bastnäsite |
1.715 |
1.76 |
0.095 |
0.11 |
4.8 |
5 |
1.810 |
1.870 |
1.715 |
1.760 |
http://www.geminterest.com |
|
Bastnäsite |
1.715 |
1.825 |
0.095 |
0.11 |
4.76 |
5.24 |
|
|
|
|
Gemmo.eu 2013 |
|
Bastnäsite |
1.717 |
1.818 |
0.101 |
0.101 |
4.95 |
5.16 |
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
|
Bastnäsite |
1.717 |
1.818 |
0.101 |
0.101 |
4.95 |
5 |
|
|
|
|
Gemology Tools Professional 2010 |
|
Bastnäsite |
1.72 |
1.82 |
0.1 |
0.1 |
4.78 |
5.2 |
1.820 |
1.820 |
1.720 |
1.720 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Bastnäsite |
1.722 |
|
|
|
5.16 |
5.16 |
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
CAUSE OF
COLOUR
|
stone |
colour |
cause
of colour |
reference |
|
Bastnäsite |
brown, orange |
rare earth elements |
http://minerals.caltech.edu |
MINERAL
INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
astrophyllite |
Bastnäsite |
Summer 2001 Gems & Gemology Gem News |
LOCALITIES