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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

Monazite

 

 

 

 

5.18

5.18

brownish-black

Sri Lanka

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Mar, p3

Monazite

1.795

1.845

0.05

0.05

5.247

5.247

reddish orange

Sri Lanka

 

 

 

 

 

 

 

 

inert

inert

The Journal of Gemmology 1977 N6, p295-299

Monazite

1.79

 

 

 

5.35

5.35

 

Brazil

0.17ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p117-118

 

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

Monazite

1.773

1.85

0.047

0.057

4.6

5.6

 

 

 

 

 

 

Gemmo.eu 2017

Monazite

1.774

1.849

0.049

0.055

4.6

5.4

1.774

1.800

1.777

1.801

1.828

1.849

http://www.geminterest.com 

Monazite

1.774

1.849

0.049

0.055

4.6

5.4

 

 

 

 

 

 

http://www.gemmology.be 

Monazite

1.774

1.849

0.049

0.055

4.6

5.4

1.774

1.800

1.777

1.801

1.828

1.849

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Monazite

1.774

1.849

0.049

0.055

4.6

5.4

1.774

1.800

1.777

1.801

1.828

1.849

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

Monazite

1.774

1.849

0.049

0.055

5.4

5.4

1.774

1.800

1.777

1.801

1.828

1.849

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

Monazite

1.795

1.845

0.05

0.05

5.2

5.2

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Monazite

1.796

1.841

0.045

0.045

4.8

5.5

1.796

1.796

1.797

1.797

1.841

1.841

Gemmological Tables, Ulrich Henn, 2004 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Monazite

brown, orange

rare earth elements

http://minerals.caltech.edu

Monazite

colour change

rare earth elements,  specifically Nd+

http://www.minsocam.org/

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

CaO

Na2O

Cr2O3

K2O

P2O5

PbO

ZrO2

ThO2

UO2

BaO

La2O3

Ce2O3

PrO2

Nd2O3

Sm2O3

Eu2O3

Gd2O3

Tb2O3

Dy2O3

Er2O3

Yb2O3

U3O8

Monazite

brownish yellow

 

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1985, 34, Nr1/2, p71

 

 

0.01

 

0.07

0.3

1.2

24.5

 

1.35

9.49

 

0.6

14.56

30.45

3.49

12.48

1.64

0.01

0.9

0.05

0.12

0.03

0.01

0.43

Monazite

reddish orange

 

Sri Lanka

The Journal of Gemmology, 1977, N6, p297

0.4

0.02

 

1

 

 

 

27.4

0.1

 

11.6

0.4

 

21.7

28.7

1.9

6

0.6

 

0.09

 

0.2