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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

Gadolinite

1,77

 

 

 

4,25

4,25

black

 

22,33ct, ranged from 1.770 to OTL, birefringence > 0.040

 

 

 

 

 

 

 

 

 

Gems & Gemology 2025 Spring, p58

 

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

Gadolinite

1.77

1.82

0.01

0.04

4

4.65

1.770

1.780

 

 

1.780

1.820

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Gadolinite

1.77

1.82

0.01

0.04

4

4.65

 

 

 

 

 

 

http://www.gemmology.be 

Gadolinite

1.77

1.82

0.01

0.04

4

4.65

1.770

1.780

 

 

1.780

1.820

http://www.geminterest.com 

Gadolinite

 

 

 

 

4

4.5

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Gadolinite

1.77

1.82

0.01

0.04

4

4.65

1.770

1.780

 

 

1.780

1.820

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA