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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

Lawsonite

1.664

1.687

0.023

0.023

3.08

3.3

light pink, near colourless, bluish

Marin County, California

0.09-0.43 ct

inert

inert

Gems & Gemology 2008 summer p171

Lawsonite

1.669

1.69

0.021

0.021

3.11

3.11

greyish blue

California, USA

0.14 ct

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2013 62/1-2, Jun, p35

 

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
Lawsonite	1.662	1.687	0.018	0.02	3.05	3.12							Gemmo.eu 2013
Lawsonite	1.664	1.687	0.019	0.023	3.05	3.3	1.664	1.665	1.674	1.675	1.684	1.687	Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007
Lawsonite	1.665	1.686	0.019	0.021	3.08	3.09							Bestimmungstabellen für Edelsteine, Birgit Günther, 2008
Lawsonite	1.665	1.686	0.019	0.019	3.05	3.12	1.665	1.665	1.674	1.674	1.684	1.686	http://www.geminterest.com
Lawsonite	1.665	1.686	0.019	0.021	3.05	3.12	1.665	1.665			1.684	1.686	Gemme, Dati per l'identificazione, P. De Stefano et al, 1993
Lawsonite	1.665	1.684	0.019	0.019	3.08	3.09	1.665	1.665	1.674	1.674	1.684	1.684	Gemmological Tables, Ulrich Henn, 2004
Lawsonite	1.665	1.686	0.019	0.019	3.05	3.12							http://www.gemmology.be
Lawsonite	1.665	1.686	0.019	0.019	3.05	3.12	1.665	1.665	1.674	1.675	1.684	1.686	Joel Arem, Color Encyclopedia of Gemstones, 1987
Lawsonite	1.665	1.684	0.019	0.019	3.08	3.09							Gems, R Webster, 5th edition 1994
Lawsonite	1.665	1.686	0.019	0.019	3.05	3.12							Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)