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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

Natrolite

1.472

1.491

0.019

0.019

2.29

2.29

colourless

 

0.81ct

1.472

1.472

1.482

1.482

1.491

1.491

 

inert

inert

ACAM lab  1449

Natrolite

1.477

1.49

0.013

0.013

2.26

2.26

 

St. Hilaire, Quebec, Canada

 

1.477

1.477

1.481

1.481

1.490

1.490

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1993 Mar, p43-45

Natrolite

1.478

1.491

0.013

0.013

2.27

2.27

colourless

Russia

0.7 ct

1.478

1.478

1.485

1.485

1.491

1.491

 

inert

inert

ACAM labo  4744

Natrolite

1.478

1.49

0.012

0.012

 

 

colourless

Bound Brook, New Jersey, USA

 

1.478

1.478

1.480

1.480

1.490

1.490

 

inert

inert

The Journal of Gemmology 1977 N3,p115-116

Natrolite

1.479

1.491

0.012

0.012

2.25

2.25

colourless

Mont Saint-Hilaire, Quebec, Canada

 

1.478

1.479

1.485

1.485

1.491

1.491

 

may fluoresce white

may fluoresce white

The Journal of Gemmology 1996 Vol 25, N1,p36

Natrolite

1.48

1.485

0.005

0.005

 

 

colourless

WSW of Hazarganji, Bela ophiolite, Pakistan

transparent, 2V= 63; cut stones : 20.62ct, 13.48ct, 11.26ct, 5.08ct, 2.53ct

 

 

 

 

 

 

 

inert

inert

The Journal of Gemmology 1998 Vol 26, N5,p308-312

Natrolite

1.48

1.48

 

 

2.15

2.15

yellow-brown

Most, Bohemia, Czech Republic

massive, cabochon, opaque

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1995 Sep, p4

 

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

Natrolite

1.473

1.496

0.013

0.013

2.2

2.26

1.473

1.485

 

 

1.483

1.496

Bestimmungstabellen fr Edelsteine, Birgit Gnther, 1981 

Natrolite

1.473

1.496

0.011

0.013

2.2

2.26

1.473

1.483

 

 

1.485

1.496

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

Natrolite

1.473

1.496

0.012

0.012

2.2

2.26

1.473

1.483

1.476

1.486

1.485

1.496

http://www.geminterest.com 

Natrolite

1.473

1.496

0.012

0.012

2.2

2.26

 

 

 

 

 

 

http://www.gemmology.be 

Natrolite

1.473

1.496

0.012

0.012

2.2

2.26

1.473

1.483

1.476

1.486

1.485

1.496

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Natrolite

1.473

1.496

0.012

0.014

2.2

2.26

1.473

1.483

1.476

1.486

1.485

1.496

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

Natrolite

1.473

1.496

0.012

0.012

2.2

2.26

 

 

 

 

 

 

Gemology Tools Professional 2010

Natrolite

1.477

1.492

0.01

0.013

2.15

2.3

 

 

 

 

 

 

Gemmo.eu 

Natrolite

1.478

1.493

0.012

0.013

2.2

2.25

1.478

1.480

1.480

1.482

1.490

1.493

Gemmological Tables, Ulrich Henn, 2004 

Natrolite

1.48

1.493

0.013

0.013

2.2

2.25

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Natrolite

1.48

1.493

0.013

0.013

2.2

2.3

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Natrolite

1.48

1.493

0.013

0.013

2.2

2.25

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Natrolite

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry)

Mont Saint-Hilaire, Rouville County

Quebec

Canada

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1994, Dez, p137

Natrolite

Hazarganji

Bela ophiolite

 

Pakistan

The Journal of Gemmology 1999, Vol 26, N5, p308-312

Natrolite

Soutesky

Decin, Ceske Stredohory Mts, Krusne Hory, Severocesky

Bohemia

Tsjechi

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1992, Dec, p166

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

Na2O

Cr2O3

K2O

Natrolite

colourless

WSW of Hazarganji, Bela ophiolite

Pakistan

The Journal of Gemmology 1998, Vol 26, N5, p311

46.55

26.74

0.05

0.07

0.04

0.08

16.34

0.07

0.06

Natrolite

colourless

Bound Brook, New Jersey

USA

The Journal of Gemmology, 1976, N3,p116

48.5

27.2

 

 

 

 

16.2

 

 

Natrolite

colourless

Bound Brook, New Jersey

USA

The Journal of Gemmology, 1976, N3,p116

47.4

26.8

 

 

 

 

16.3