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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

Sinhalite

1.662

1.704

0.042

0.042

3.49

3.49

light yellow

Sri Lanka

0.86ct

 

 

 

 

 

 

 

inert

inert

ACAM Lab  2306

Sinhalite

1.664

1.708

0.044

0.044

3.48

3.48

green-yellow

Sri Lanka

1.39ct

1.664

1.664

1.692

1.692

1.708

1.708

 

inert

inert

ACAM Lab  3885

Sinhalite

1.665

1.7

0.035

0.035

3.47

3.47

colourless (very faint brownish tint)

Sri Lanka

2.47ct

 

 

 

 

 

 

faint absorption line in the blue

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Jul p106

Sinhalite

1.666

1.706

0.038

0.038

3.48

3.5

 

Ohngaing, Mogok, Birma

 

1.666

1.668

 

 

1.704

1.706

452, 463, 475, 493nm lines, broad band in the violet

inert

inert

Gems & Gemology 2007 winter, p382

Sinhalite

1.667

1.705

0.038

0.038

3.47

3.47

pale yellow

 

 

1.667

1.667

1.697

1.697

1.705

1.705

 

 

 

Gems & Gemology 1952 Summer, p173-175

Sinhalite

1.667

1.7

0.033

0.033

3.49

3.49

orangy yellow

Eheliyagoda, Sabaragamuwa Province, Sri Lanka

10.88ct

 

 

 

 

 

 

lines at 455, 465 and 507nm

inert

inert

GIA Gem Database  35589

Sinhalite

1.667

1.7

0.033

0.033

3.48

3.48

yellowish orange

Sri Lanka

40.69ct

 

 

 

 

 

 

lines at 456, 500 nm

inert

inert

GIA Gem Database  34104

Sinhalite

1.668

1.702

0.034

0.034

3.54

3.54

yellow-brown

Sri Lanka

1.8ct

1.668

1.668

1.684

1.684

1.702

1.702

 

inert

inert

ACAM Lab  2305

Sinhalite

1.669

1.704

0.035

0.035

3.48

3.49

olive green

Elahera, Sri Lanka

 

 

 

 

 

 

 

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1985 34, Nr 1/2, p13-19

Sinhalite

1.669

1.706

0.036

0.037

3.48

3.49

near colourless, brownish yellow

Elahera, Sri Lanka

 

1.669

1.669

1.702

1.702

1.706

1.706

525, 493, 475, 463, 452, 435nm

inert

inert

Gems & Gemology 1986 Summer, p91

Sinhalite

1.669

1.707

0.038

0.038

3.48

3.48

brown

 

 

1.669

1.669

1.699

1.699

1.707

1.707

 

 

 

Gems & Gemology 1952 Summer, p173-175

Sinhalite

1.669

1.707

0.038

0.038

3.51

3.51

light yellowish green

 

1.77ct

1.669

1.669

1.687

1.687

1.707

1.707

 

 

 

ACAM Lab  557

Sinhalite

1.67

1.7

0.03

0.03

3.5

3.5

dark orange

Sri Lanka

11.24ct

 

 

 

 

 

 

broad absorption below 430nm; lines at 452, 457, 468, 480 and 500nm

inert

inert

GIA Gem Database  34111

Sinhalite

1.671

1.708

0.037

0.037

3.49

3.49

dark brown

 

 

1.671

1.671

1.700

1.700

1.708

1.708

 

 

 

Gems & Gemology 1952 Summer, p173-175

Sinhalite

1.674

1.703

0.029

0.029

3.55

3.55

greenish brown

Sri Lanka

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1998 Sep, p169

 

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

Sinhalite

1.665

1.712

0.036

0.042

3.46

3.48

1.665

1.676

 

 

1.702

1.712

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Sinhalite

1.665

1.712

0.035

0.042

3.46

3.5

1.665

1.676

 

 

1.704

1.712

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

Sinhalite

1.665

1.712

0.035

0.037

3.47

3.5

 

 

 

 

 

 

http://www.gemmology.be 

Sinhalite

1.665

1.712

0.035

0.037

3.475

3.5

1.665

1.676

1.697

1.697

1.705

1.712

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Sinhalite

1.665

1.712

0.035

0.039

3.45

3.5

1.665

1.676

1.694

1.704

1.704

1.712

http://www.geminterest.com 

Sinhalite

1.665

1.712

0.035

0.042

3.47

3.5

1.665

1.678

1.697

1.697

1.704

1.712

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

Sinhalite

1.665

1.712

0.036

0.039

3.46

3.5

 

 

 

 

 

 

Gemology Tools Professional 2010

Sinhalite

1.666

1.71

0.037

0.042

3.46

3.5

1.666

1.672

1.697

1.701

1.704

1.710

Gemmological Tables, Ulrich Henn, 2004 

Sinhalite

1.666

1.713

0.034

0.039

3.45

3.51

 

 

 

 

 

 

Gemmo.eu 

Sinhalite

1.668

1.707

0.038

0.04

3.48

3.54

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Sinhalite

1.67

1.71

0.038

0.038

3.47

3.49

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Sinhalite

 

 

0.038

0.038

3.47

3.49

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Sinhalite

brown

+- -> Fe³+ charge transfer and Fe²+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

rutile

Sinhalite

The Journal of Gemmology 1986, 20, 2, p98-99

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Sinhalite

Ohngaing (Ohn Gaing, Ohn Kai)

Mogok

Mandalay

Myanmar

Gems & Gemology 2007 winter, p382

Sinhalite

 

Elahera District

Central Province

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1985,34, Nr 1/2, p13-19

Sinhalite

Matale

Matale District

Central Province

Sri Lanka

Gemmologie Jul 1999, p90

Sinhalite

Embilipitiya (Embilipitya; Ambilipitiya)

Ratnapura District

Sabaragamuwa province

Sri Lanka

Gemmologie Jul 1999, p90

Sinhalite

Deniyaya, Matara

Matara District

Southern Province

Sri Lanka

Gemmologie Jul 1999, p90

Sinhalite

 

Avissawella

Western Province

Sri Lanka

Gemmologie Jul 1999, p90

 

CHEMICAL DATA (%)