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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

Hornblende

1.62

1.642

0.022

0.022

3.12

3.12

greenish brown to brown

Embilipitiya, Sri Lanka

 

1.620

1.620

1.632

1.632

1.642

1.642

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1993 Dec, p163-169

Hornblende

1.625

1.647

0.02

0.02

3.09

3.09

greenish-brown

Baffin Island, Nunavut Territory, Canada

biaxial positive, 1.62ct - 3.03ct

1.625

1.627

1.632

1.633

1.644

1.647

 

moderate : yellow

inert

The Journal of Gemmology 1986 Vol20, N2,p100-107

Ferrohornblende

1.65

1.65

 

 

3.36

3.36

black

 

beads, spot RI

 

 

 

 

 

 

 

 

 

Gems & Gemology 1994 Fall, p186-187

 

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

Hornblende

1.615

1.725

0.014

0.022

3.1

3.3

 

 

 

 

 

 

Gemmo.eu 2013

Hornblende

1.62

1.642

0.022

0.022

3.12

3.12

1.620

1.620

1.632

1.620

1.642

1.642

Gemmological Tables, Ulrich Henn, 2004 

Ferrohornblende

1.641

1.727

0.014

0.021

3.12

3.3

1.641

1.704

1.657

1.718

1.662

1.727

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Hornblende

green to brown

Fe+ in various sites

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Hornblende

 

Baffin Island

Northwest Territories

Canada

The Journal of Gemmology 1986, Vol 20, N2, p100-107

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

V2O3

K2O

F

Hornblende

 

 

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1993, Dec, p166

44.74

14.81

18.74

1.94

0.28

12.18

2.39

 

 

2.44

1.87

Hornblende

 

 

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1993, Dec, p166

43.91

14.61

18.79

1.73

0.21

12.27

2.39

 

 

2.49

1.91

Hornblende

 

 

Sri Lanka

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1993, Dec, p166

45

14.71

18.51

1.92

0.22

11.96

2.37

 

 

2.44

1.49

Hornblende

 

Baffin Island

Canada

The Journal of Gemmology 1986, 1986, Vol20, N2 p102

45

14.1

20.1

0.62

0.73

12.1

3

0.1

0.11

1.3

1.4

Hornblende

 

Baffin Island

Canada

The Journal of Gemmology 1986, 1986, Vol20, N2 p102

43.8

14.7

19.3

1.3

0.45

12.7

2.3

0.08

 

1.6

1.6

Hornblende

 

Baffin Island

Canada

The Journal of Gemmology 1986, 1986, Vol20, N2 p102

46.5

11.7

20.7

0.31

1.1

12.1

3.4

 

 

0.5

1.1