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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Tektite - Libyan desert glass

1.46

1.46

2.22

2.22

light yellow

Egypt

4.49ct

 

inert

inert

ACAM lab  3978

Tektite - Libyan desert glass

1.465

1.465

2.21

2.21

light yellow

Egypt

52.35ct cabochon

 

inert

inert

ACAM lab  4889

Tektite - Darwin glass

1.478

1.482

2.25

2.52

pale to dark green

Mt Darwin, Tasmania, Australia

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1997 Mar, p7-12

Tektite - Moldavite

1.481

1.482

2.341

2.341

green

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2015 Dez, p403-409

Tektite - Moldavite

1.482

1.482

2.31

2.31

green

Czech Republic

7.6ct

 

inert

inert

ACAM Lab  4167

Tektite - Moldavite

1.488

1.49

2.356

2.356

green

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2015 Dez, p403-409

Tektite - Moldavite

1.49

1.49

2.34

2.34

green

Czech Republic

21.55ct

 

inert

inert

ACAM Lab  827

Tektite - Indochinite

1.51

1.51

2.44

2.44

black

Billiton, Indonesia

7.25 ct, "billitonite"

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2017 Jun, p4

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Tektite - Libyan desert glass

1.459

1.464

2.19

2.22

Gemmo.eu 

Tektite - Libyan desert glass

1.46

1.465

2.2

2.22

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

Tektite - Moldavite

1.46

1.6

2.21

2.96

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

Tektite - Libyan desert glass

1.46

1.46

2.2

2.2

Gemology Tools Professional 2010

Tektite

1.46

1.54

2.21

2.96

Gemology Tools Professional 2010

Tektite

1.462

1.543

2.21

2.96

http://www.gemmology.be 

Tektite - Libyan desert glass

1.462

1.462

2.21

2.21

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Moldavite

1.468

1.503

2.32

2.4

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Tektite - Darwin glass

1.47

1.482

2.26

2.26

Gemmological Tables, Ulrich Henn, 2004 

Tektite - Darwin glass

1.47

1.48

2.75

2.96

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Darwin glass

1.47

1.48

2.75

2.96

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

Tektite - Bediasite

1.48

1.51

2.33

2.43

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Bediasite

1.48

1.51

2.33

2.43

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

Tektite - Moldavite

1.48

1.49

2.3

2.5

John Sinkakas, Gemstone and mineral data book,1972 

Tektite - Moldavite

1.48

1.54

2.27

2.4

http://www.geminterest.com 

Tektite - Moldavite

1.48

1.54

2.27

2.4

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Moldavite

1.48

1.54

2.34

2.39

Gems, R Webster, 5th edition 1994 

Tektite - Moldavite

1.48

1.54

2.27

2.4

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

Tektite - Moldavite

1.48

1.51

2.32

2.4

Gemology Tools Professional 2010

Tektite - Georgia tektite/ Massachussetts tektite

1.485

1.485

2.33

2.33

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Georgia tektite/ Massachussetts tektite

1.485

1.485

2.33

2.34

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

Tektite - Indochinite

1.49

1.51

2.4

2.44

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Indochinite

1.49

1.51

2.4

2.44

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

Tektite - Moldavite

1.49

1.51

2.36

2.44

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Tektite - Moldavite

1.49

1.51

2.36

2.44

Gemmological Tables, Ulrich Henn, 2004 

Tektite - Australite

1.5

1.52

2.38

2.46

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Australite

1.5

1.52

2.38

2.46

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

Tektite - Ivory Coast tektite

1.5

1.52

2.4

2.51

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Ivory Coast tektite

1.5

1.52

2.4

2.51

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

Tektite - Javaite

1.509

1.509

2.43

2.45

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Javaite

1.509

1.509

2.43

2.45

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

Tektite - Billitonite

1.51

1.53

2.46

2.51

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Billitonite

1.51

1.53

2.46

2.51

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

Tektite - Philippinite

1.513

1.513

2.44

2.45

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tektite - Philippinite

1.513

1.513

2.44

2.45

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Tektite

brown

Fe³+ in octahedral coordination

Gems & Gemology Summer 1988

Tektite - Moldavite

green

Fe²+ in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

anatase

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

anhydrite

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

aragonite

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

cristobalite

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

rutile

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

zircon

Tektite - Libyan desert glass

http://www.b14643.de/Sahara/LDG/index.htm

 

LOCALITIES

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

K2O

CuO

Tektite - Darwin glass

green

Tasmania

Australia

Gemmologie, Zeitschrift der deutschen gemmologischen Gesellschaft, 1996, Mar, p11

85.3

8.4

 

2.28

0.74

 

 

 

 

2.06

1.23

Tektite - Indochinite

 

 

Thailand

The Journal of Gemmology 2000, Vol 27, N°5,p282

75.13

12.93

0.96

 

0.61

2.32

0.29

0.15

5.09

2.51

 

Tektite - Moldavite

 

 

 

The Journal of Gemmology 2000, Vol 27, N°5,p282

76.59

9.8

2.07

 

0.27

5.22

 

0.29

1.75

4.02