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INVESTIGATIONS

 

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

Allanite

1.64

1.828

0.013

0.036

3.40

4.20

 

 

 

 

 

 

http://www.gemmology.be 

Allanite

1.64

1.828

0.013

0.036

3.40

4.20

1.640

1.791

1.650

1.581

1.660

1.828

http://www.geminterest.com 

Allanite

1.64

1.828

0.013

0.036

3.40

4.20

1.640

1.791

1.650

1.815

1.660

1.828

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Allanite

1.64

1.828

0.013

0.036

3.40

4.20

1.640

1.791

1.650

1.815

1.660

1.828

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

Allanite

1.64

1.828

0.019

0.045

3.4

4.2

 

 

 

 

 

 

Gemology Tools Professional 2010

Allanite

1.645

1.825

0.01

0.035

3.5

4.2

 

 

 

 

 

 

Gemmo.eu 2013

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Allanite

brown

colored by iron and radiation damage and possibly by rare earth elements

http://minerals.caltech.edu

 

MINERAL INCLUSIONS