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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

Legrandite

1.695

1.74

0.045

0.045

4.01

4.01

yellow

Mexico

0.34ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p120

Legrandite

1.695

1.738

0.038

0.04

3.95

3.95

yellow

Mexico

 

1.695

1.698

1.713

1.714

1.733

1.738

 

inert

inert

http://www.geminterest.com 2008

 

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

Legrandite

1.675

1.735

0.06

0.06

3.98

4.04

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Legrandite

1.675

1.74

0.06

0.06

3.98

4.04

1.675

1.702

1.690

1.709

1.735

1.740

http://www.geminterest.com 

Legrandite

1.675

1.74

0.06

0.06

3.96

4.06

1.675

1.702

 

 

1.735

1.740

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

Legrandite

1.675

1.74

0.06

0.06

3.98

4.04

 

 

 

 

 

 

http://www.gemmology.be 

Legrandite

1.675

1.74

0.06

0.06

3.98

4.04

1.675

1.702

1.690

1.709

1.735

1.740

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Legrandite

1.675

1.735

0.06

0.06

3.99

4.01

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Legrandite

1.675

1.735

0.06

0.06

3.98

4.04

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Legrandite

1.675

1.74

0.06

0.06

3.98

4.04

1.675

1.702

1.690

1.709

1.735

1.740

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)