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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

1.537

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