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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

Epidote

1.72

1.754

0.034

0.034

3.41

3.41

 

Mali

 

1.720

1.720

1.739

1.739

1.754

1.754

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1996 Dec, p155-156

Epidote

1.72

1.741

0.019

0.02

3.36

3.38

 

Sri Lanka

 

1.720

1.721

1.730

1.731

1.739

1.741

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p3

Epidote

1.721

1.769

0.02

0.035

3.39

3.42

 

Minas Gerais, Brazil

 

1.721

1.734

1.735

1.756

1.741

1.769

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p3

Epidote

1.721

1.748

0.027

0.027

3.37

3.37

 

Switzerland

 

1.721

1.721

1.736

1.736

1.748

1.748

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p3

Epidote

1.724

1.748

0.024

0.024

3.4

3.4

 

Mozambique

 

1.724

1.724

1.734

1.734

1.748

1.748

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p3

Epidote

1.725

1.752

0.025

0.027

3.43

3.44

 

California, USA

 

1.725

1.727

1.736

1.739

1.750

1.752

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p3

Epidote

1.725

1.743

0.018

0.018

3.43

3.43

very dark brownish yellow

 

9.72ct

 

 

 

 

 

 

broad absorption below 420nm, line at 460nm

inert

inert

GIA Gem Database  34004

Epidote

1.731

1.773

0.031

0.036

3.37

3.44

 

Knappenwand, Untersulzbachtal, Austria

 

1.731

1.738

1.748

1.753

1.761

1.773

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p1-9

Epidote

1.732

1.767

0.035

0.035

3.44

3.44

 

Elahera, Sri Lanka

 

1.732

1.732

1.746

1.746

1.767

1.767

457, 455 (strong)

inert

inert

Gems & Gemology 1986 Summer, p91

Epidote

1.738

1.772

0.034

0.034

3.49

3.49

dark green, transparent

Pakistan

0.71 ct, tawmawite

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p122

Epidote

1.739

1.779

0.04

0.04

 

 

very dark green

 

5ct

 

 

 

 

 

 

a broad band at 455 nm, a faint line at 470nm, a cut-off at 430nm

 

 

Gems & Gemology 1987 Summer p104

 

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

Epidote

1.713

1.78

0.034

0.039

3.3

3.48

1.713

1.735

 

 

1.733

1.780

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Epidote

1.714

1.798

0.014

0.05

3.3

3.5

 

 

 

 

 

 

Gemmo.eu 2013

Epidote

1.715

1.797

0.005

0.053

3.25

3.5

1.715

1.751

 

 

1.734

1.797

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

Epidote

1.715

1.773

0.014

0.039

3.3

3.5

1.715

1.734

1.722

1.753

1.729

1.773

Gemmological Tables, Ulrich Henn, 2004 

Epidote

1.715

1.797

0.015

0.049

3.38

3.49

 

 

 

 

 

 

http://www.gemmology.be 

Epidote

1.715

1.797

0.015

0.051

3.25

3.52

1.715

1.751

1.725

1.784

1.734

1.797

http://www.geminterest.com 

Epidote

1.715

1.797

0.015

0.049

3.38

3.49

1.715

1.751

1.725

1.784

1.734

1.797

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Epidote

1.715

1.797

0.015

0.049

3.3

3.5

1.715

1.751

1.725

1.784

1.734

1.797

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

Epidote

1.715

1.797

0.015

0.049

3.38

3.49

 

 

 

 

 

 

Gemology Tools Professional 2010

Epidote

1.729

1.78

0.019

0.045

3.3

3.5

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Epidote

1.736

1.77

0.034

0.034

3.25

3.51

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Epidote

1.736

1.77

0.034

0.034

3.25

3.5

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Epidote

green and brown

Fe³+ in distorted octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

actinolite

Epidote

Zeitschrift der Deutschen Gemmologischen Zeitschrift, 1990, Sep, p1-9

apatite

Epidote

Zeitschrift der Deutschen Gemmologischen Zeitschrift, 1990, Sep, p1-9

calcite

Epidote

Zeitschrift der Deutschen Gemmologischen Zeitschrift, 1990, Sep, p1-9

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Epidote

Knappenwand, Untersulzbachtal

Hohe Tauern

Salzburg

Austria

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991, Apr p1-9

Epidote

Ankazobe Department, Ankazobe Pegmatite Field

Central Merina Region

Antananarivo Province

Madagascar

Gemmologie, Dez 1999, p196

Epidote

Mahazoma epidote locality, Mahazoma Commune, Maevatanana District

Betsiboka Region

Mahajanga (Majunga) Province

Madagascar

Behier, J. (1960): Annales Géologiques de Madagascar XXIX, Tananarive, 78p [p.35]

Epidote

 

Same

Kilimanjaro Region

Tanzania

Gems & Gemology 2000 winter p325

Epidote

 

Babati

Manyara Region

Tanzania

Gemmologie, 1997, Mar, p31

 

CHEMICAL DATA