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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

Anorthite

1.57

1.57

 

 

2.75

2.75

bright mottled green with dark green and brown inclusions

 

cabochon, spot RI

 

 

 

 

 

 

 

reddish

 

Gems & Gemology 1980 Spring, p269-270

Anorthite

1.575

1.588

0.013

0.013

2.77

2.77

colourless to pale yellowish

Fugoppe, Yoichi County, Hokkaido, Japan

2.71ct

1.575

1.575

1.583

1.583

1.588

1.588

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Jun, p62-63

 

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

Anorthite

1.517

1.535

0.005

0.009

2.55

2.63

 

 

 

 

 

 

Gemmo.eu 2013

Anorthite

1.573

1.59

0.013

0.013

2.75

2.77

1.573

1.577

1.580

1.585

1.585

1.590

http://www.geminterest.com 

Anorthite

1.573

1.59

0.013

0.013

2.75

2.77

1.573

1.577

1.580

1.585

1.585

1.590

Tables of Gemstone Identification, Roger Dedeyn, Ivo Quintens, 2007 

Anorthite

1.575

1.588

0.013

0.013

2.76

2.76

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Anorthite

1.575

1.589

0.013

0.013

2.74

2.77

1.575

1.577

 

 

1.588

1.589

Gemme, Dati per l'identificazione, P. De Stefano et al, 1993 

Anorthite

1.575

1.588

0.013

0.013

2.77

2.77

1.575

1.575

1.583

1.583

1.588

1.588

Gemmological Tables, Ulrich Henn, 2004 

Anorthite

1.577

1.59

0.013

0.013

2.75

2.77

1.577

1.577

1.585

1.585

1.590

1.590

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Anorthite

1.577

1.59

0.013

0.013

2.75

2.77

 

 

 

 

 

 

http://www.gemmology.be 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

pargasite

Anorthite

The Journal of Gemmology 2003, Vol 28, N°7, p386

ruby

Anorthite

The Journal of Gemmology 2003, Vol 28, N°7, p386

spinel

Anorthite

The Journal of Gemmology 2003, Vol 28, N°7, p386

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Anorthite

 

 

Hokkaido

Japan

Gemmologie , Dec 2001 p186

Anorthite

 

Great Sitkin Island

Alaska

USA

Joel Arem, Color Encyclopedia of Gemstones, 1987