|
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 |
|
Labradorite |
1.553 |
1.561 |
0.008 |
0.008 |
2.69 |
2.69 |
yellowish |
|
|
|
|
|
|
|
|
|
|
|
ACAM labo |
|
Labradorite sunstone |
1.553 |
1.563 |
0.007 |
0.011 |
2.68 |
2.7 |
red and green |
Congo ? |
1.97-4.856 ct |
1.553 |
1.555 |
|
|
1.562 |
1.563 |
|
inert |
weak to distinct orange |
The Journal of Gemmology 2004 Vol 29, N°1, p15-23 |
|
Labradorite |
1.554 |
1.562 |
0.008 |
0.008 |
2.69 |
2.69 |
colourless |
|
|
|
|
|
|
|
|
|
|
|
ACAM labo |
|
Labradorite |
1.555 |
1.563 |
0.008 |
0.008 |
2.7 |
2.7 |
|
Oregon, USA |
50.5% anorthite (=almost andesine) |
1.555 |
1.555 |
1.558 |
1.558 |
1.563 |
1.563 |
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1992 Apr, p49-51 |
|
Labradorite |
1.558 |
1.568 |
0.01 |
0.01 |
2.7 |
2.7 |
light yellow |
|
|
|
|
|
|
|
|
|
|
|
Gems & Gemology 1963 Winter, p114 |
|
Labradorite |
1.56 |
1.571 |
0.009 |
0.01 |
2.71 |
2.72 |
pale yellow, transparent |
Casas Grandes, Chihuahua, Mexico |
|
|
|
|
|
|
|
|
very weak orange |
inert |
Gems & Gemology 2006 winter, p 274 |
|
Labradorite sunstone |
1.56 |
1.57 |
0.007 |
0.009 |
2.711 |
2.717 |
yellow, red-orange, bluish-green, yellowish green, orange, violet |
Rabbit hilly, Lake County, Oregon |
|
1.560 |
1.563 |
|
|
1.569 |
1.570 |
|
|
|
Gems & Gemology 1976 Summer p
162-167 |
|
Labradorite |
1.56 |
1.572 |
0.012 |
0.012 |
2.72 |
2.72 |
|
|
0.6ct |
|
|
|
|
|
|
|
|
|
ACAM labo |
|
Labradorite sunstone |
1.56 |
1.572 |
0.007 |
0.01 |
2.7 |
2.72 |
pale red and green |
Oregon, USA |
2.91 and 3.63 ct, slight 'schiller' effect |
1.560 |
1.565 |
|
|
1.570 |
1.572 |
|
inert |
inert |
The Journal of Gemmology 2004 Vol 29, N°1, p15-23 |
|
Labradorite sunstone |
1.56 |
1.57 |
0.01 |
0.01 |
2.79 |
2.79 |
orangy red |
Oregon, USA |
7.71ct |
|
|
|
|
|
|
cut-off at 420nm |
inert |
inert |
GIA Gem Database 35197 |
|
Labradorite |
1.561 |
1.57 |
0.009 |
0.009 |
2.69 |
2.72 |
pale yellow |
Ketchikan, Alaska, USA |
transparent |
|
|
|
|
|
|
none |
weak red |
inert |
Gems & Gemology 2009 spring p 67 |
|
Labradorite |
1.561 |
1.569 |
0.008 |
0.008 |
2.71 |
2.71 |
dark orangy red |
Ponderosa Mine, Burns, Harney County, Oregon, USA |
2.60ct |
|
|
|
|
|
|
broad absorption below 430 and between 570-590nm |
inert |
inert |
GIA Gem Database 33138 |
|
Labradorite sunstone |
1.563 |
1.572 |
0.009 |
0.009 |
2.67 |
2.72 |
moderate to heavily saturated red, pink, orange, green: aventurescence |
Ponderosa mine, Oregon |
|
1.563 |
1.563 |
1.568 |
1.568 |
1.572 |
1.572 |
|
inert |
inert |
Gems & Gemology 1991 winter,
p220-233 |
|
Labradorite |
1.566 |
1.572 |
0.006 |
0.006 |
2.72 |
2.72 |
light orangy yellow |
Plush, Lake County, Oregon, USA |
22.01ct |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 33097 |
|
Labradorite |
1.57 |
|
|
|
2.7 |
2.7 |
multicoloured, labradoriscence, opaque |
Finland |
30.82ct cabochon, IRspot reading |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 33096 |
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 |
|
Labradorite |
1.53 |
1.572 |
0.012 |
0.012 |
2.69 |
2.72 |
1.530 |
1.560 |
1.563 |
1.563 |
1.572 |
1.572 |
Joel Arem, Color Encyclopedia of Gemstones, 1987 |
|
Labradorite |
1.55 |
1.573 |
0.007 |
0.012 |
2.67 |
2.72 |
1.550 |
1.564 |
1.558 |
1.568 |
1.564 |
1.573 |
http://www.geminterest.com |
|
Labradorite |
1.553 |
1.573 |
0.007 |
0.012 |
2.69 |
2.72 |
1.553 |
1.563 |
1.563 |
1.563 |
1.562 |
1.573 |
Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Labradorite |
1.553 |
1.574 |
0.007 |
0.012 |
2.67 |
2.73 |
|
|
|
|
|
|
Gemmo.eu 2017 |
|
Labradorite |
1.554 |
1.573 |
0.008 |
0.01 |
2.68 |
2.71 |
1.55 |
1.56 |
1.56 |
1.57 |
1.56 |
1.57 |
Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification
(2006), 873pp |
|
Labradorite |
1.555 |
1.573 |
0.008 |
0.012 |
2.65 |
2.76 |
1.555 |
1.563 |
|
|
1.564 |
1.573 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Labradorite |
1.556 |
1.571 |
0.009 |
0.01 |
2.69 |
2.7 |
1.556 |
1.561 |
1.559 |
1.565 |
1.565 |
1.571 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Labradorite |
1.559 |
1.571 |
0.009 |
0.011 |
2.65 |
2.75 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
|
Labradorite |
1.559 |
1.568 |
0.009 |
0.009 |
2.65 |
2.75 |
|
|
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
|
Labradorite |
1.56 |
1.573 |
0.008 |
0.01 |
2.7 |
2.72 |
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data book,1972 |
|
Labradorite |
1.56 |
1.572 |
0.012 |
0.012 |
2.69 |
2.72 |
|
|
|
|
|
|
http://www.gemmology.be |
|
Labradorite |
1.56 |
1.573 |
0.008 |
0.008 |
2.68 |
2.69 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Labradorite |
multicolours |
diffraction of light by the internal lamellar structure |
Gems & Gemology Summer 1988 |
|
Labradorite |
green and orange-pink |
could be Cu-InterValenceChargeTransfer or Cu° pairs |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
hematite |
Labradorite |
Gemmological Tables, Ulrich Henn , GGA, 2004 |
|
ilmenite |
Labradorite |
Gemmological Tables, Ulrich Henn , GGA, 2004 |
|
magnetite |
Labradorite |
Gemmological Tables, Ulrich Henn , GGA, 2004 |
|
olivine |
Labradorite |
Gems & Gemology 2016 Spring p 77-78 |
|
pyrite |
Labradorite |
Gems & Gemology 1976 Summer p162-167 |
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Labradorite |
|
Nain |
Labrador |
Canada |
Gemmologie Dec 2001 p185 |
|
Labradorite |
|
|
|
Finland |
Gemmologie Dec 2001 p185 |
|
Labradorite |
|
|
|
India |
Gemmologie Dec 2001 p185 |
|
Labradorite |
Ambatondrazaka District |
Alaotra-Mangoro Region |
Toamasina (Tamatave) Province |
Madagascar |
Gemmologie, Dez 1999, p196 |
|
Labradorite |
Betioky Department |
Southwestern Region |
Tuléar (Toliara) Province |
Madagascar |
Gemmologie, Dez 1999,p196 |
|
Labradorite |
|
|
|
Mexico |
Gemmologie Dec 2001 p185 |
|
Labradorite |
|
Casas Grandes area |
Chihuahua |
Mexico |
Gems & Gemology 2006 winter, p 274 |
|
Labradorite |
|
|
|
Russia |
Gemmologie Dec 2001 p185 |
|
Labradorite |
Ketchikan District |
Prince of Wales-Outer Ketchikan Borough |
Alaska |
USA |
Gems & Gemology Spring 2009, p67 |
|
Labradorite - sunstone |
Rabbit Hills |
Lake County |
Oregon |
USA |
Gemmologie Dec 2001 p185 |
|
Labradorite - sunstone |
Dust Devil Mine, Plush |
Lake County |
Oregon |
USA |
Gems & Gemology 2013 Fall |
|
Labradorite - sunstone |
Ponderosa Sunstones Mine |
Harney County |
Oregon |
USA |
Gems & Gemology 2013 Fall |
CHEMICAL DATA
(%)
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
FeO |
TiO2 |
CaO |
Na2O |
K2O |
P2O5 |
|
|
Labradorite |
green (two directions), red (along 1 direction) |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
51.03 |
31.13 |
0.01 |
0.29 |
0.044 |
14.12 |
3.31 |
0.05 |
0.008 |
|
Labradorite |
colourless |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
51.76 |
30.43 |
|
0.38 |
|
14.16 |
3.18 |
0.04 |
|
|
Labradorite |
red |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
52.05 |
29.98 |
|
0.43 |
|
14.23 |
3.24 |
0.005 |
|
|
Labradorite |
green |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
51.52 |
30.61 |
|
0.39 |
|
14.34 |
3.1 |
0.04 |
|
|
Labradorite |
colourless |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
51.11 |
31.01 |
0.001 |
0.31 |
0.047 |
14.09 |
3.36 |
0.05 |
0.007 |
|
Labradorite |
red |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
51.83 |
30.51 |
0.01 |
0.32 |
0.043 |
1343 |
3.74 |
0.11 |
0.009 |
|
Labradorite |
green (one direction), red (along 2 directions) |
Ponderosa Mine, Oregon |
USA |
Gems & Gemology 1991 Winter p227 |
50.93 |
31.2 |
0.011 |
0.29 |
0.045 |
14.23 |
3.24 |
0.05 |
0.008 |