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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

Pargasite

1.62

1.64

0.02

0.02

3.17

3.17

Yellowish brown

Myanmar

1.78ct

 

 

 

 

 

 

 

weak yellow

inert

Gems & Gemology 2004 Fall, p256

Pargasite

1.625

1.64

0.015

0.015

3.03

3.03

Yellowish green

Pakistan

0.59ct

 

 

 

 

 

 

 

Very weak yellowish green

inert

Gems & Gemology 2004 Fall, p256

Pargasite

1.628

1.648

0.02

0.02

3.07

3.09

orangy brown to yellowish brown

Dodoma region, Tanzania

1.23 to 8.36ct

1.628

1.628

1.633

1.633

1.648

1.648

 

moderate to strong chalky yellow

inert

Gems & Gemology 2011 Spring, p65

Pargasite

1.63

1.645

0.015

0.015

3.06

3.07

green

Astor Valley, Pakistan

2.07 ct, transparent

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2009 58/3-4/Dec, p84-85

 

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

Pargasite

1.612

1.671

0.018

0.024

3.03

3.19

 

 

 

 

 

 

Gemmo.eu 2013

Pargasite

1.613

1.635

0.022

0.022

3.07

3.18

 

 

 

 

 

 

http://www.gemmology.be 

Pargasite

1.613

1.635

0.022

0.022

3.069

3.181

1.613

1.613

1.618

1.618

1.635

1.635

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Pargasite

1.613

1.65

0.019

0.024

3.06

3.2

1.613

1.629

1.618

1.635

1.635

1.650

http://www.geminterest.com 

Pargasite

1.613

1.65

0.02

0.022

3.07

3.18

1.613

1.630

1.618

1.618

1.635

1.650

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

Pargasite

1.613

1.635

0.022

0.022

3.069

3.181

 

 

 

 

 

 

Gemology Tools Professional 2010

Pargasite

1.628

1.651

0.023

0.023

 

 

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Pargasite

green to brown

Feł+ in various sites

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)