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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

Lazulite

1.606

1.648

0.032

0.034

2.99

3.22

 

Minas Gerais, Bahia and Rio Grande do Norte (Brazil)

 

1.606

1.614

 

 

1.639

1.648

 

 

 

The Australian Gemmologist 2003 Vol 21, N10, p390-399

Lazulite

1.608

1.642

0.032

0.032

3.09

3.1

blue

Afghanistan

 

1.608

1.610

1.630

1.632

1.640

1.642

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2003 Mar, p47-48

Lazulite

1.61

1.64

0.03

0.03

3.12

3.12

blue, transparent

Brazil

0.12ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p118

Lazulite

1.61

1.64

0.03

0.03

3.12

3.12

green

Gilgit, Pakistan

 

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2001 Jun, p65-74

Lazulite

1.616

1.645

0.027

0.027 

 

 

blue

 

0.48ct

1.616

1.616

1.633

1.633

1.645

1.645

 

 

 

Gems & Gemology 1975 Spring, p16

 

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

Lazulite

1.604

1.663

0.031

0.037

3

3.22

1.604

1.626

1.630

1.654

1.641

1.663

http://www.geminterest.com 

Lazulite

1.604

1.662

0.031

0.036

2.96

3.08

1.604

1.625

 

 

1.639

1.662

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

Lazulite

1.604

1.644

0.032

0.034

3.05

3.17

1.604

1.610

1.628

1.633

1.638

1.644

Gemmological Tables, Ulrich Henn, 2004 

Lazulite

1.604

1.662

0.031

0.037

3.08

3.22

 

 

 

 

 

 

http://www.gemmology.be 

Lazulite

1.604

1.662

0.031

0.036

3.08

3.08

1.604

1.625

1.633

1.653

1.642

1.662

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Lazulite

1.604

1.663

0.031

0.04

3.07

3.24

1.604

1.626

1.626

1.654

1.637

1.663

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

Lazulite

1.61

1.64

0.03

0.03

3.04

3.13

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Lazulite

1.612

1.646

0.031

0.035

3.04

3.14

1.604

1.620

 

 

1.638

1.655

Bestimmungstabellen fr Edelsteine, Birgit Gnther, 2008 

Lazulite

1.615

1.645

0.036

0.036

3.09

3.1

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Lazulite

1.615

1.645

0.036

0.036

3.1

3.1

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Lazulite

blue

Fe+-O-Fe+ charge transfer

Gems & Gemology Summer 1988

Lazulite

green

Fe+-O-Fe+ charge transfer (much less then blue lazulite) and Fe+-Ti4 IVCT

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2001 Jun p70-73

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

albite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

augelite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

brazilianite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

kyanite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

muscovite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

quartz

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

sericite

Lazulite

The Australian Gemmologist 2003 Vol 21,N 10, p397

 

LOCALITIES

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Ga2O3

ZnO

K2O

H2O

SrO

P2O5

BaO

SO3

Lazulite

 

Alto dos Preas, Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

28.05

0.11

8.4

3.02

 

7.21

 

 

 

6.14

 

46

 

 

Lazulite

 

Algodao (or Azul), Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

13.46

35.23

0.09

8.19

1.36

0.26

2.02

 

0.47

0.49

 

 

31.97

0.08

 

Lazulite

 

Algodao (or Azul), Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

5.78

35.21

0.06

8.63

1.53

 

1.03

 

0.53

0.3

 

 

41.03

 

 

Lazulite

 

Alto dos Preas, Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

31.3

 

9.53

4.42

0.06

1.92

 

 

 

5.9

 

46.38

 

 

Lazulite

 

Algodao (or Azul), Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

12.37

37.32

 

10.35

0.24

 

1.02

 

0.02

0.21

 

 

32.01

0.25

 

Lazulite

 

Alto dos Preas, Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

25.7

0.1

8.4

3.3

 

9.43

 

 

 

6

 

45.81

 

 

Lazulite

 

Algodao (or Azul), Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

7.67

35.45

 

9.58

1.02

0.03

2.49

 

0.05

0.3

 

 

36.87

0.24

 

Lazulite

 

Formaao Farm, Diamantina, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

0.57

30.95

0.06

8.77

4.88

0.08

0.46

 

 

0.04

 

 

47.94

 

 

Lazulite

 

Morro de Chapu, Botamirium, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

0.35

28.63

0.04

7.82

4.32

0.07

0.04

 

 

0.04

 

 

52.39

 

 

Lazulite

 

Alto dos Preas, Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

27.6

0.17

8.41

4.1

 

7.1

 

 

 

5.72

 

46.1

 

 

Lazulite

 

Rapadura Farm, Diamantina, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

33.73

 

11.62

2.62

 

 

 

 

 

 

0.05

48.72

 

0.03

Lazulite

 

Rapadura Farm, Diamantina, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

32.68

 

12.89

1.22

 

 

 

 

 

 

0.05

49.93

 

0.01

Lazulite

 

Dumba Hill, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

31.7

 

14.6

3.2

 

 

 

 

 

5.7

 

44.9

 

 

Lazulite

 

Datas, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

32.55

 

11.97

3.29

0.16

 

7360

 

 

5.1

 

46.12

 

 

Lazulite

 

Tejucana Mining, Jequitinhonha river, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

29.9

 

14.1

3.3

 

 

 

 

 

5.4

 

47.2

 

 

Lazulite

 

Alto dos Preas, Rio Grande do Norte

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

31.9

0.17

8.9

3.17

0.01

6.87

 

 

 

5.85

 

41.06

 

 

Lazulite

 

Corrego da Prata, Minas Gerais

Brazil

The Australian Gemmologist 2003, Vol 21, N10, p396

 

27.7

 

16.5

4.1

 

 

 

 

 

6.7

 

43.9