|
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 |
Oligoclase |
1.53 |
1.54 |
0.01 |
0.01 |
2.68 |
2.68 |
light greenish blue |
Madawaska Mine, Bancroft District, Ontario, Canada |
7.81ct |
|
|
|
|
|
|
broad absorption below 420nm |
inert |
inert |
GIA Gem Database 33121 |
oligoclase -Sunstone |
1.53 |
1.541 |
0.009 |
0.01 |
2.63 |
2.64 |
brownish orange and brown |
India |
semitransparent to translucent, 5.13 - 8.06 ct, inclusions : reddish
orange platelets of hematite |
|
|
|
|
|
|
Weak absorption in the blue and green |
weak red |
inert |
Gems & Gemology 2005 Summer, p178 |
Oligoclase |
1.531 |
1.543 |
0.01 |
0.012 |
2.63 |
2.65 |
light green |
Tanzania |
|
1.531 |
1.533 |
|
|
1.541 |
1.543 |
|
inert |
inert |
Gems & Gemology 2008 spring p83 |
oligoclase -Sunstone |
1.535 |
1.547 |
0.01 |
0.011 |
|
|
colourless with red inclusions, aventurism |
Oregon, USA |
|
1.535 |
1.536 |
1.538 |
1.539 |
1.545 |
1.547 |
|
|
|
The Journal of Gemmology 2004 29, 2, p 72-74 |
oligoclase -Sunstone |
1.536 |
1.546 |
0.01 |
0.01 |
2.65 |
2.65 |
colourless with red inclusions |
Oregon |
=oligoclase |
1.536 |
1.536 |
1.539 |
1.539 |
1.546 |
1.546 |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2003 Sep, p117-118 |
oligoclase -Sunstone |
1.536 |
1.54 |
0.004 |
0.004 |
2.69 |
2.69 |
orange |
Tanzania |
12.72ct, "sunstone" |
|
|
|
|
|
|
|
inert |
inert |
GIA Gem Database 33122 |
oligoclase -Sunstone |
1.536 |
1.54 |
0.004 |
0.004 |
2.69 |
2.69 |
orange |
Tanzania |
|
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 33122 |
oligoclase -Sunstone |
1.537 |
1.547 |
0.01 |
0.01 |
2.64 |
2.64 |
light grayish green with numerous eye-visible iridescent orange platelets |
Tanzania |
7.88ct, hematite inclusions |
|
|
|
|
|
|
|
|
|
Gems & Gemology 2002 Summer, p177 |
Oligoclase |
1.538 |
1.549 |
0.011 |
0.011 |
2.64 |
2.64 |
mint green |
Loliondo, Tanzania |
transparent, 8.64ct |
|
|
|
|
|
|
broad absorption with maximum at 620nm (like in amazonite) |
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2009 58/3-4/Dec, p78 |
oligoclase -Sunstone |
1.539 |
1.549 |
0.01 |
0.01 |
2.64 |
2.65 |
colourless with red inclusions |
Meto Hills, Tanzania |
aventurescent effect caused by tabular hematite inclusions |
|
|
|
|
|
|
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2010 Jun, p52-54 |
Oligoclase |
1.54 |
1.55 |
0.01 |
0.01 |
2.63 |
2.63 |
translucent white with orangy red (hematite) inclusions |
|
cabochon, 15.28ct, "strawberry
feldspar" |
1.540 |
1.540 |
1.543 |
1.543 |
1.550 |
1.550 |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2015 Dez, p48 |
Oligoclase |
|
|
|
|
2.81 |
2.81 |
dark orange |
Coimbatore, Tamil Nadu, India |
11.35ct, cabochon, translucent, cat's eye |
|
|
|
|
|
|
broad absorption below 500 |
|
|
GIA Gem Database 33124 |
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 |
oligoclase -Sunstone |
1.52 |
1.555 |
0.009 |
0.01 |
2.62 |
2.67 |
1.530 |
1.540 |
|
|
1.540 |
1.550 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
oligoclase -Sunstone |
1.525 |
1.548 |
0.01 |
0.01 |
2.63 |
2.67 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
oligoclase -Sunstone |
1.527 |
1.59 |
0.007 |
0.01 |
2.57 |
2.77 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
Oligoclase |
1.53 |
1.553 |
0.007 |
0.012 |
2.62 |
2.68 |
|
|
|
|
|
|
Gemmo.eu 2013 |
Oligoclase |
1.531 |
1.55 |
0.007 |
0.011 |
2.62 |
2.69 |
1.531 |
1.542 |
1.541 |
1.546 |
1.545 |
1.550 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Oligoclase |
1.531 |
1.551 |
0.007 |
0.01 |
2.62 |
2.67 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
oligoclase -Sunstone |
1.532 |
1.553 |
0.007 |
0.01 |
2.62 |
2.67 |
1.532 |
1.544 |
1.536 |
1.549 |
1.542 |
1.553 |
http://www.geminterest.com |
Oligoclase |
1.538 |
1.55 |
0.01 |
0.01 |
2.63 |
2.66 |
1.538 |
1.540 |
1.541 |
1.543 |
1.548 |
1.550 |
Gemmological Tables, Ulrich Henn,
2004 |
Oligoclase |
1.539 |
1.55 |
0.007 |
0.011 |
2.62 |
2.67 |
1.539 |
1.542 |
|
|
1.544 |
1.550 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Oligoclase |
1.54 |
1.55 |
0.01 |
0.01 |
2.63 |
2.68 |
|
|
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Oligoclase |
1.542 |
1.549 |
0.007 |
0.007 |
2.62 |
2.67 |
1.542 |
1.542 |
1.546 |
1.546 |
1.549 |
1.549 |
Joel Arem, Color Encyclopedia of Gemstones,
1987 |
Oligoclase |
1.542 |
1.549 |
0.007 |
0.007 |
|
|
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972 |
Oligoclase |
1.542 |
1.549 |
0.007 |
0.007 |
2.62 |
2.67 |
|
|
|
|
|
|
http://www.gemmology.be |
Oligoclase |
1.542 |
1.549 |
0.007 |
0.007 |
2.62 |
2.65 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994 |
oligoclase -Sunstone |
|
|
|
|
2.62 |
2.65 |
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
oligoclase -Sunstone |
red |
hematite inclusions |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2010, Jun p 52-54 |
oligoclase -Sunstone |
red |
submicroscopic metallic copper particles |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
Inclusion |
Stone |
Reference |
hematite |
oligoclase -Sunstone |
Gemmological Tables, Ulrich Henn , GGA, 2004 |
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
sunstone - oligoclase |
|
|
Orissa |
India |
Gems&gemology 2005, Summer p178 |
sunstone - oligoclase |
Hidra (Hittero) |
Flekkefjord |
Vest-Agder |
Norway |
Webster, Gems 5th edition, 1994,p215 |
CHEMICAL DATA
(%)
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
FeO |
CaO |
Na2O |
|
oligoclase -Sunstone |
colourless with red inclusions |
Oregon |
USA |
The Journal of Gemmology 2007 |
64.85 |
22.04 |
|
2.57 |
10.31 |
oligoclase -Sunstone |
colourless with red inclusions |
Meto Hills |
Tanzania |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 2010, Jun, p53 |
63.47 |
22.61 |
0.09 |
3.56 |
8.82 |