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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

Moonstone - Feldspar

1.518

1.53

0.006

0.01

2.56

2.6

 

Zillertal, Austria

"adular"

1.518

1.520

1.522

1.526

1.524

1.530

 

strong red-pink

inert

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.518

1.528

0.006

0.008

2.56

2.6

 

Sri Lanka

 

1.518

1.520

1.522

1.524

1.524

1.528

 

strong red

red-violet

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.518

1.528

0.006

0.008

2.56

2.6

 

India

 

1.518

1.520

1.522

1.524

1.524

1.528

 

strong red

red-violet

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.518

1.53

0.006

0.01

2.56

2.6

 

Zillertal, Austria

"adular"

1.518

1.520

1.522

1.526

1.524

1.530

 

strong red-pink

inert

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.518

1.528

0.006

0.008

2.56

2.6

 

Sri Lanka

 

1.518

1.520

1.522

1.524

1.524

1.528

 

strong red

red-violet

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.518

1.528

0.006

0.008

2.56

2.6

 

India

 

1.518

1.520

1.522

1.524

1.524

1.528

 

strong red

red-violet

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.52

1.53

0.008

0.01

2.57

2.57

colourless, white adularescence with a slight blue component

Zillertal, Tirol, Austria

18.69ct and 27.56ct

 

 

 

 

 

 

 

weak orange

weak blue

The Journal of Gemmology 2014 Vol 34,N3, p190

Moonstone - Feldspar

1.52

1.525

0.005

0.005

2.53

2.53

 

Switserland

"adular"

1.520

1.520

1.522

1.522

1.525

1.525

 

grey-bluish

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.52

1.525

0.005

0.005

2.53

2.53

 

Switserland

"adular"

1.520

1.520

1.522

1.522

1.525

1.525

 

grey-bluish

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.525

1.531

0.005

0.005

2.57

2.58

very light yellow-grey, moderate bluish adularescence, transparent to semitransparent

20 km ENE of Ihosy, Madagascar

 

 

 

 

 

 

 

nihil

weak to moderate orange red

very weak violet-blue

Gems & Gemology 2006 winter, p 276

Moonstone - Feldspar

1.53

1.54

0.01

0.01

2.64

2.64

very light grey to very light yellow with strong blue adularescence

Kilosa, 80 km west of Morogoro, Tanzania

albitic moonstone, transparent to semi-transparent

 

 

 

 

 

 

 

weak red

inert

Gems & Gemology 2005 Spring p 60

Moonstone - Feldspar

1.531

1.542

0.009

0.009

2.62

2.63

 

Tanzania

=albite

1.531

1.533

1.534

1.536

1.540

1.542

 

red-pink

white-blue

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.531

1.542

0.009

0.009

2.62

2.63

 

Tanzania

=albite

1.531

1.533

1.534

1.536

1.540

1.542

 

red-pink

white-blue

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.55

1.567

0.01

0.01

2.7

2.69

 

India

rainbow moonstone

1.550

1.557

1.555

1.563

1.560

1.567

 

violet-pink

strong white-pink

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.55

1.567

0.01

0.01

2.7

2.69

 

India

rainbow moonstone

1.550

1.557

1.555

1.563

1.560

1.567

 

violet-pink

strong white-pink

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2019 68/3-4, p44

Moonstone - Feldspar

1.553

1.566

0.013

0.013

2.69

2.69

colourless with iridescent colours

Malawi

rainbow moonstone (labradorite), 12.22ct

 

 

 

 

 

 

 

greenish yellow

chalky purplish pink

The Journal of Gemmology 2014 Vol 34, No 3, p200

Moonstone - Feldspar

1.554

1.56

0.006

0.006

2.66

2.7

near colourless with strong blue, orange, yellow, green, violet and pink adularescence

Zambia

rainbow moonstone, 2.08 to 4.24ct, and 8.33ct, border between andesine and labradorite

 

 

 

 

 

 

 

weak red

inert to weak blue

Gems & Gemology 2012 Summer, p146-147

Moonstone - Feldspar

1.56

1.56

 

 

2.69

2.69

blue labradorescence

Patna, Bihar, India

 

 

 

 

 

 

 

 

weakly chalky, weak pinkish

moderately chalky

Gems & Gemology 1997 summer, p144-145

Moonstone - Feldspar

1.56

1.56

 

 

2.69

2.69

near colourless, displaying orange, yellow, green, blue and violet adularescence

Madagascar

4.41ct cabochon, spot RI, rainbow moonstone

 

 

 

 

 

 

none

weak red

weak white

Gems & Gemology 2012 Fall, p223-224

 

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

Moonstone - Feldspar

1.508

1.536

0.005

0.008

2.55

2.61

 

 

 

 

 

 

Gemology Tools Professional 2010

Moonstone - Feldspar

1.517

1.56

0.004

0.011

2.55

2.67

 

 

 

 

 

 

Gemmo.eu 2015

Moonstone - Feldspar

1.518

1.525

0.005

0.006

2.56

2.59

 

 

 

 

 

 

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Moonstone - Feldspar

1.518

1.536

0.005

0.009

2.54

2.6

1.518

1.519

 

 

1.526

1.536

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

Moonstone - Feldspar

1.518

1.527

0.006

0.007

2.56

2.6

1.518

1.520

1.522

1.524

1.524

1.527

Gemmological Tables, Ulrich Henn, 2004 

Moonstone - Feldspar

1.518

1.54

0.004

0.012

2.53

2.72

1.518

1.526

1.522

1.533

1.522

1.540

http://www.geminterest.com 

Moonstone - Feldspar

 

 

 

 

2.56

2.58

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Moonstone - Feldspar

blue

raleigh scattering of light by lamellar structure

Gems & Gemology Summer 1988

Moonstone - Feldspar

green

Fe+

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez 2014, p87

Moonstone - Feldspar

rainbow colours

results from a combination of adularescence and labradorescence

Gems & Gemology Fall 2012, p224

Moonstone - Feldspar

red

Fe+

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez 2014, p87

Moonstone - Feldspar

smoky brown

Fe+ (smoky moonstone from Imblupe, Sri Lanka)

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez 2014, p83

Moonstone - Feldspar

yellow

caused by iron oxide impurities concentrated in fissures

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft Juni 2014, p47

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

moonstone

 

Coimbatore district

Madras

India

Webster, Gems 5th edition (1994), p209

moonstone

 

Imblupe(Imbulpe)

 

Sri Lanka

Gemmologie 4 Dec 2001 p183

moonstone

 

Dumbara district

Central Province

Sri Lanka

Webster, Gems 5th edition (1994), p209

moonstone

 

Kandy district

Central Province

Sri Lanka

Webster, Gems 5th edition (1994), p209

moonstone

 

Ambalangoda

Southern Province

Sri Lanka

Webster, Gems 5th edition (1994), p209

moonstone

 

Meetiyagoda (Metiyagoda)

Southern Province

Sri Lanka

Gemmologie 4 Dec 2001 p182

moonstone

Kilosa, 80 km west of Morogoro

 

 

Tanzania

Gems & Gemology Spring 2005, p60

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Ga2O3

Fe2O3

K2O

SrO

Rb2O

PbO

BaO

Moonstone

 

Zillertal

Austria

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

62.1

17.39

 

 

0.02

 

0.02

1.14

 

 

 

18.84

 

 

 

 

Moonstone

 

 

India

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2014, p85

61.25

18.71

 

 

0.02

 

0.39

2.92

 

 

 

11.51

 

 

 

1.08

Moonstone

 

 

India

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

61.25

18.7

 

 

0.02

 

0.39

2.92

 

 

 

11.51

 

 

 

 

Moonstone

rainbow moonstone

 

India

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

53.76

27.08

 

 

0.1

 

10.03

5.55

 

 

 

0.3

 

 

 

 

Moonstone

 

 

Sri Lanka

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2014, p85

62.41

18.28

 

 

0.09

 

0.24

4.66

 

 

 

9.6

 

 

 

0.03

Moonstone

 

 

Sri Lanka

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

62.41

18.28

 

 

0.09

 

0.24

4.66

 

 

 

9.6

 

 

 

 

Moonstone

 

Balangoda

Sri Lanka

The Journal of Gemmology 1992, Vol 23, N1 p30

65.1

18.6

0.03

 

0.03

0.02

0.2

1.8

0.02

0.002

 

13.8

0.08

0.04

 

0.004

Moonstone

dark smoky

Imbulpe

Sri Lanka

The Journal of Gemmology 1994, Vol 24, N3, p180

66.5

19

 

 

0.094

0.02

0.74

5.9

 

 

0.014

7.7

0.05

0.013

 

0.04

Moonstone

light smoky

Imbulpe

Sri Lanka

The Journal of Gemmology 1994, Vol 24, N3, p180

66.4

19.1

 

0.005

0.06

0.02

0.64

5.34

 

 

0.003

8.41

0.05

0.009

 

0.03

Moonstone

colourless

Metiyagoda

Sri Lanka

The Journal of Gemmology 1994, Vol 24, N3, p180

66.2

18.8

 

 

0.014

0.004

0.3

3.7

 

 

0.007

10.1

0.02

0.07

0.02

0.004

Moonstone

 

 

Switserland

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

64.03

17.54

 

 

0.06

 

 

0.018

 

 

 

17.93

 

 

 

 

Moonstone

yellow

 

Tanzania

Gemmologie Juni 2014, p49

65.17

21.07

 

 

0.06

 

2.19

10.14

 

 

 

0.49

 

 

 

0.02

Moonstone

 

 

Tanzania

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2014, p85

64.81

20.75

 

 

0.06

 

1.6

9.42

 

 

 

0.47

 

 

 

0.16

Moonstone

 

 

Tanzania

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft, Dez, 2019, p44

64.81

20.75

 

 

0.06

 

1.6

9.42

 

 

 

0.47