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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

Variscite

1.55

1.56

 

 

2.12

2.23

grey-green

Yauli, Peru

RI spot reading

 

 

 

 

 

 

 

inert

weak green-yellow

Gems & Gemology 2011 Fall, p251

Variscite

1.561

1.589

0.028

0.028

2.55

2.55

green

Hunsrück, Germany

 

 

 

 

 

 

 

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1988 36, Nr3/4, p 170

Variscite

1.57

1.57

 

 

2.43

2.43

turquoise

 

 

 

 

 

 

 

 

weak band 430-400

 

white

ACAM labo 

Variscite

1.57

1.582

 

 

2.49

2.55

light bluish green, light to dark green, brown matrix

Woodlands Station, Western Australia

opaque to translucent, chelsea: grey to pale pink

 

 

 

 

 

 

diffuse bands 685nm, 650nm, 610nm, absorption of blue-violet

inert

inert

The Journal of Gemmology 2008 Vol31, N°3-4, p111-124

Variscite

1.57

1.59

 

 

 

 

turquoise

 

cabochon 20.16ct , resembling spiderweb turquoise

 

 

 

 

 

 

 

 

 

Gems & Gemology 2006 Spring, p61

Variscite

1.58

1.58

 

 

2.46

2.46

bluish, opaque

 

 

 

 

 

 

 

 

 

 

 

ACAM labo 

Variscite

 

 

 

 

2.32

2.36

white to light blue to green

Tajikistan

hardness 4-5

 

 

 

 

 

 

 

inert

inert

Gems & Gemology 2016 Spring, p 60-65

 

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

Variscite

1.55

1.594

0.01

0.031

2.2

2.6

1.550

1.560

 

 

1.580

1.594

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

Variscite

1.55

1.59

0.03

0.03

2.4

2.6

1.550

1.560

 

 

1.580

1.590

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Variscite

1.55

1.595

0.02

0.033

2.2

2.62

 

 

 

 

 

 

Gemmo.eu 2013

Variscite

1.55

1.594

0.031

0.031

2.57

2.61

1.550

1.563

1.565

1.588

1.570

1.594

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

Variscite

1.554

1.593

 

 

2.4

2.6

 

 

 

 

 

 

Gemology Tools Professional 2010

Variscite

1.56

1.56

 

 

2.4

2.57

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Variscite

1.56

1.593

0.03

0.03

2.42

2.58

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Variscite

1.56

1.594

0.01

0.031

2.4

2.6

1.560

1.570

1.565

1.584

1.570

1.594

http://www.geminterest.com 

Variscite

1.56

1.56

 

 

2.4

2.6

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Variscite

1.563

1.594

0.031

0.031

2.2

2.57

1.563

1.563

1.588

1.588

1.594

1.594

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Variscite

1.563

1.594

0.031

0.031

2.4

2.6

1.563

1.563

1.588

1.588

1.594

1.594

Gemmological Tables, Ulrich Henn, 2004 

Variscite

1.563

1.594

0.031

0.031

2.2

2.57

 

 

 

 

 

 

http://www.gemmology.be 

Variscite

1.563

1.594

0.031

0.031

2.2

2.57

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Variscite

green

Cr³+ presumably in octahedral coordination

Gems & Gemology Summer 1988

Variscite

green

V³+

http://minerals.caltech.edu

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Variscite

Low Mill, Woodlands station

Upper Gascoyne Shire

Western Australia

Australia

The Journal of Gemmology 2008 Vol31, N°3-4, p111-124

Variscite

Little Green Monster Variscite Mine, Clay Canyon, Clay Canyon, Fairfield

Utah County

Utah

USA

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

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

TiO2

CaO

Na2O

Cr2O3

V2O3

Fe2O3

K2O

F

P2O5

PbO

SO3

As2O3

Variscite

 

Woodlands Station, Western Australia

Australia

The Journal of Gemmology 2008, Vol31, N°3-4, p119

0.47

31.6

 

0.14

 

0.08

0.09

0.35

1.37

0.13

0.05

45.3

 

0.43

 

Variscite

 

Woodlands Station, Western Australia

Australia

The Journal of Gemmology 2008, Vol31, N°3-4, p119

1.04

32.1

 

0.31

 

0.1

0.21

0.32

1.08

0.02

0.1

45.9

 

0.09

 

Variscite

 

Woodlands Station, Western Australia

Australia

The Journal of Gemmology 2008, Vol31, N°3-4, p119

0.5

30.6

 

0.4

0.19

0.19

0.18

0.46

1.86

0.06

0.11

44.4

0.08

0.31

 

Variscite

 

Woodlands Station, Western Australia

Australia

The Journal of Gemmology 2008, Vol31, N°3-4, p119

1.46

31.5

 

0.29

0.05

0.12

0.16

0.5

1.27

0.02

0.07

45.7

 

0.11

 

Variscite

 

Pannecé

France

Gems & Gemology 2016, Spring, p64

0.03

29.1

0.05

0.03

 

 

0.2

0.4

0.15

 

 

44.7

 

 

 

Variscite

 

Sardinia

Italy

Gems & Gemology 2016, Spring, p64

1.4

28.2

0.02

0.02

 

 

0.3

0.4

2

 

 

44.3

 

 

 

Variscite

 

Ervedosa

Portugal

Gems & Gemology 2016, Spring, p64

0.04

29.4

0.03

0.02

 

 

0.4

0.11

1.5

 

 

45.3

 

 

 

Variscite

slightly green

 

Tajikistan

Gems & Gemology 2016, Spring, p64

 

25.68

 

0.15

0.16

0.11

0.11

0.15

9.06

 

 

43.61

 

0.76

0.46

Variscite

white with green hue

 

Tajikistan

Gems & Gemology 2016, Spring, p64

 

27.05

 

 

 

0.18

0.1

0.16

5.99

0.13

 

44.47

 

0.68

0.29

Variscite

bluish green

 

Tajikistan

Gems & Gemology 2016, Spring, p64

 

25.91

 

 

 

0.12

0.16

0.14

8.3

 

 

43.63

 

0.32

0.28

Variscite

bright green

 

Tajikistan

Gems & Gemology 2016, Spring, p64

 

25.72

 

 

 

 

0.16

0.13

9.4

0.14

 

42.76

 

0.36

0.55

Variscite

 

Utah

USA

Gems & Gemology 2016, Spring, p64

0.06

29.3

0.03

0.08

 

 

0.14

0.64

0.05

 

 

44.4