|
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 |
Orthoclase |
1.515 |
1.52 |
0.005 |
0.005 |
2.58 |
2.58 |
light brownish yellowish orange |
Sri Lanka |
4.37ct |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 34839 |
Orthoclase |
1.517 |
1.528 |
0.011 |
0.011 |
2.58 |
2.58 |
yellowish |
|
4.49ct |
1.517 |
1.517 |
1.521 |
1.521 |
1.528 |
1.528 |
|
inert |
inert |
ACAM lab
2240 |
Orthoclase |
1.518 |
1.526 |
0.008 |
0.008 |
2.56 |
2.56 |
greenish grey to light green |
Sri Lanka |
up to 3ct |
|
|
|
|
|
|
|
|
|
The Australian Gemmologist 1982 may, p240 |
Orthoclase |
1.518 |
1.54 |
|
|
2.58 |
2.58 |
reddish brown with aventurescence, adularescence and lattice pattern |
Harts Range, Northern Territory, Australia |
rainbow lattice sunstone |
|
|
|
|
|
|
|
|
|
The Journal of Gemmology 2018 Vol 36, (1), p44-52 |
Orthoclase |
1.519 |
1.53 |
0.011 |
0.011 |
2.55 |
2.55 |
colourless |
Sri Lanka |
2.08ct |
|
|
|
|
|
|
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1999 Jul p106 |
Orthoclase |
1.519 |
1.524 |
0.005 |
0.005 |
2.45 |
2.51 |
green with chatoyance |
Vietnam |
cabochon 13.18ct and 47.61ct |
|
|
|
|
|
|
|
strong blue-white |
inert |
The Journal of Gemmology 2020 Vol 37 (2), p140 |
Orthoclase |
1.52 |
1.526 |
0.006 |
0.006 |
2.56 |
2.56 |
pink |
Mogok, Myanmar |
15.98ct, transparent , pink colour probably from Cr replacing Al |
|
|
|
|
|
|
|
weak orange |
weak orange |
The Australian Gemmologist 2004 Vol 22,
N°1, p32-34 |
Orthoclase |
1.52 |
1.528 |
0.008 |
0.008 |
2.6 |
2.6 |
yellow brown , aventurescent, chatoyance and asterism |
Tanzania |
|
1.520 |
1.520 |
1.525 |
1.525 |
1.528 |
1.528 |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2005 Mar, p43-46 |
Orthoclase |
1.52 |
1.525 |
0.005 |
0.005 |
2.57 |
2.57 |
light orangy yellow |
Mogok, Myanmar |
15.21ct |
|
|
|
|
|
|
line at 452nm |
weak orange |
weak orange |
GIA Gem Database 34569 |
Orthoclase |
1.52 |
1.524 |
0.004 |
0.004 |
2.57 |
2.57 |
yellow |
Itrongahy, Betroka district, Toliara Province, Madagascar |
25.33ct |
|
|
|
|
|
|
420, 448nm lines |
inert |
inert |
GIA Gem Database 33098 |
Orthoclase |
1.52 |
1.524 |
0.004 |
0.004 |
2.57 |
2.57 |
yellow |
Itrongahy, Betroka district, Toliara Province, Madagascar |
58.57ct |
|
|
|
|
|
|
broad absorption below 430nm, line at 453nm |
weak red |
weak orangy red |
GIA Gem Database 34392 |
Orthoclase |
1.52 |
1.525 |
0.005 |
0.005 |
2.8 |
2.58 |
colourless |
|
14.79ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35482 |
Orthoclase |
1.52 |
1.525 |
0.005 |
0.005 |
2.6 |
2.6 |
greenish yellow |
Sri Lanka |
14.64ct |
|
|
|
|
|
|
line at 452nm |
inert |
inert |
GIA Gem Database 34837 |
Orthoclase |
1.52 |
1.525 |
0.005 |
0.005 |
2.56 |
2.56 |
|
Oregon, USA |
27.58ct |
|
|
|
|
|
|
line at 455nm |
inert |
inert |
GIA Gem Database 5200 |
Orthoclase |
1.521 |
1.529 |
0.008 |
0.008 |
2.58 |
2.58 |
green |
Vietnam |
transparent |
|
|
|
|
|
|
none |
moderate green |
inert |
Gems & Gemology 2005 winter,
p354-355 |
Orthoclase |
1.521 |
1.529 |
0.008 |
0.008 |
2.645 |
2.645 |
green |
Felicio dos Santos, Minas Gerais, Brazil |
"barium-orthoclase", 0.5ct |
|
|
|
|
|
|
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1994 Jun, p5-13 |
Orthoclase |
1.521 |
1.531 |
0.01 |
0.01 |
2.6 |
2.6 |
|
Norway |
labradorescent; 85,7% orthoclase, 6.6%
albite, 7.7% anorthite |
1.521 |
1.521 |
1.527 |
1.527 |
1.531 |
1.531 |
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1994 Dez, p106 |
Orthoclase |
|
|
|
|
2.54 |
2.54 |
colourless |
India |
8.57ct, cabochon, chatoyancy |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 34314 |
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 |
Orthoclase |
1.508 |
1.536 |
0.005 |
0.008 |
2.55 |
2.61 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
Orthoclase |
1.517 |
1.54 |
0.004 |
0.011 |
2.55 |
2.6 |
|
|
|
|
|
|
Gemmo.eu
|
Orthoclase |
1.518 |
1.539 |
|
|
2.55 |
2.63 |
1.518 |
1.529 |
1.522 |
1.533 |
1.522 |
1.539 |
Joel Arem, Color Encyclopedia of Gemstones,
1987 |
Orthoclase |
1.518 |
1.53 |
0.007 |
0.009 |
2.55 |
2.57 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Orthoclase |
1.518 |
1.536 |
0.005 |
0.009 |
2.55 |
2.6 |
1.518 |
1.519 |
|
|
1.526 |
1.536 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Orthoclase |
1.518 |
1.539 |
0.004 |
0.007 |
2.55 |
2.63 |
|
|
|
|
|
|
http://www.gemmology.be |
Orthoclase |
1.518 |
1.529 |
0.005 |
0.005 |
2.55 |
2.57 |
1.518 |
1.526 |
|
|
1.525 |
1.529 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Orthoclase |
1.518 |
1.539 |
0.004 |
0.01 |
2.55 |
2.63 |
1.518 |
1.529 |
1.522 |
1.533 |
1.522 |
1.539 |
http://www.geminterest.com |
Orthoclase |
1.518 |
1.539 |
0.012 |
0.012 |
2.55 |
2.63 |
1.518 |
1.529 |
|
|
1.522 |
1.539 |
Tables of Gemstone Identification, Roger Dedeyn, Ivo
Quintens, 2007 |
Orthoclase |
1.52 |
1.54 |
0.005 |
0.008 |
2.56 |
2.57 |
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972 |
Orthoclase |
1.52 |
1.54 |
0.008 |
0.008 |
2.56 |
2.59 |
1.520 |
1.530 |
|
|
1.530 |
1.540 |
Gems, R Webster, 5th edition 1994 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Orthoclase |
pink |
could be due to presence of Cr replacing Al |
The Australian Gemmologist 2004, Vol 22,
N°1, p34 |
Orthoclase |
pink to red |
microscopic hematite and/or lepidocrocite inclusions |
Gems & Gemology Summer 1988 |
Orthoclase |
yellow |
Fe³+ in tetrahedral coordination |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
LOCALITIES
CHEMICAL DATA
(%)