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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

Tremolite

1.6

1.62

0.02

0.02

3

3

 

Fowler, St. Lawrence County, New York.

cat's-eye, hexagonite, 1.86ct and 2.72ct, spot RI

 

 

 

 

 

 

 

 

 

Gems & Gemology 1985 Summer, p110

Tremolite

1.602

1.63

0.028

0.028

3.03

3.03

red-violet

Fowler, St. Lawrence County, New York

hexagonite

 

 

 

 

 

 

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

Tremolite

1.602

1.632

0.025

0.026

2.99

3.01

bright green

Kenya

 

1.602

1.607

1.613

1.618

1.628

1.632

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

Tremolite

1.604

1.632

0.028

0.028

3.03

3.03

apple green

Tanzania

 

1.604

1.604

1.619

1.619

1.632

1.632

absorption of red and blue

weak to good: yellow-green

inert

http://www.geminterest.com 2008

Tremolite

1.605

1.634

0.029

0.029

2.96

2.96

yellow-green

Pakistan

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2004 Dec, p123

Tremolite

1.607

1.633

0.023

0.024

3.01

3.01

yellow-green

Taiwan

 

1.607

1.609

 

 

1.630

1.633

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

Tremolite

1.608

1.631

0.023

0.023

3.01

3.01

yellow-green

Lelatema, Tanzania

 

1.608

1.608

1.616

1.616

1.631

1.631

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

smaragdite

1.608

1.63

0.022

0.022

 

 

emerald green

Merelani, Tanzania

 

 

 

 

 

 

 

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

Tremolite

1.61

1.635

0.025

0.025

3.07

3.07

yellowish green

Merelani, Tanzania

 

 

 

 

 

 

 

none

greenish yellow

weak orange

Gems & Gemology 2007 summer p146-148

Tremolite

1.61

1.635

0.025

0.025

2.97

2.97

yellowish green

Tanzania

0.32 ct

 

 

 

 

 

 

bands at 435 and 650nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2013 62/1-2, Jun, p34

Tremolite

1.611

1.639

0.028

0.028

3.3

3.3

emerald green (Cr)

Tanzania

 

1.611

1.611

1.623

1.623

1.639

1.639

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987  p37

 

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

Tremolite

1.56

1.643

0.017

0.028

2.9

3.2

1.560

1.562

1.613

1.613

1.624

1.643

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tremolite

1.56

1.643

0.017

0.028

2.9

3.3

 

 

 

 

 

 

http://www.gemmology.be 

Tremolite

1.56

1.643

0.017

0.028

2.9

3.2

1.560

1.613

1.613

1.624

1.624

1.643

http://www.geminterest.com 

Tremolite

1.56

1.643

 

 

 

 

1.560

1.562

1.613

1.613

1.624

1.643

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

Tremolite

1.56

1.643

0.17

0.028

2.9

3.2

 

 

 

 

 

 

Gemology Tools Professional 2010

Tremolite

1.599

1.637

0.023

0.028

2.99

3.02

1.599

1.613

1.613

1.626

1.631

1.637

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

Tremolite

1.6

1.642

0.022

0.03

2.9

3

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Tremolite

1.6

1.635

0.02

0.02

2.96

2.98

1.600

1.608

 

 

1.620

1.635

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Tremolite

1.6

1.62

0.02

0.02

2.98

2.98

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Tremolite

1.6

1.637

0.024

0.029

2.94

3.15

 

 

 

 

 

 

Gemmo.eu 2013

Tremolite

1.602

1.632

0.022

0.028

2.95

3.07

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Tremolite

1.602

1.643

0.021

0.027

2.9

3.2

1.602

1.608

 

 

1.624

1.643

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

Tremolite

1.602

1.631

0.023

0.026

2.99

3.01

1.602

1.608

1.613

1.619

1.628

1.631

Gemmological Tables, Ulrich Henn, 2004 

Tremolite

1.605

1.636

0.027

0.027

2.99

3.05

1.605

1.613

1.616

1.624

1.630

1.636

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

Smaragdite

1.608

1.63

0.022

0.022

3.24

3.3

1.608

1.608

1.618

1.618

1.630

1.630

http://www.geminterest.com 

Smaragdite

1.7

1.7

 

 

3.25

3.25

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Tremolite

pink

Mn³+  in octahedral coordination

Gems & Gemology Summer 1988

Tremolite

violet

Mn³+  in octahedral coordination

Alain Abréal, juillet 2002

Tremolite

yellowish green

appears to be related to the presence of trace amounts of V3+ and Cr3+ in the octahedral sites

Gems & Gemology Summer 2007 p147

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Tremolite

Merelani Hills (Mererani), Umba Valley

Lelatema Mts

Arusha Region

Tanzania

Gemmologie, 1997, Mar, p31

Tremolite

 

Lamartine

 

Uganda

Gemmologie, Sep 1996, p136

hexagonite-Tremolite

Fowler

St Lawrence County

New York

USA

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

 

CHEMICAL DATA (%)