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

Legrandite

1.699

1.739

0.037

0.04

4.08

4.12

intense yellow to yellowish orange

4 stones, 0.43ct to 5.15ct, transparent to semi-transparent

1.699

1.701

1.706

1.706

1.738

1.739

no features

The Journal of Gemmology 2018 36(2), p 100

Legrandite

1.7

1.738

0.038

0.038

4.07

4.07

yellow

Ojuela mine, Mapimi district, Durango, Mexico

0.57ct

inert

inert

http://www.spec4gem.info/index.php 2018

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 Dedeyne, Ivo Quintens, 2007 

Legrandite

1.702

1.74

0.06

0.06

4.01

4.01

1.702

1.702

1.709

1.709

1.740

1.740

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp 

Legrandite

1.7

1.742

0.05

0.07

3.97

4.05

Gemmo.eu 2018

STONE

LOCALITIES

REFERENCE

Legrandiet

Ojuela mine

Mapimi

Durango

Mexico

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp