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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

Augite

1.682

1.702

0.02

0.02

3.2

3.2

dark green

 

8ct

 

 

 

 

 

 

faint line at 500nm

inert

inert

Gems & Gemology 1989 spring p35

Augite

1.702

1.728

0.026

0.026

3.35

3.35

black

 

1.5ct

 

 

 

 

 

 

 

 

 

Gems & Gemology 1988 Fall, p170

 

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

Augite

1.67

1.772

0.024

0.028

3.2

3.55

 

 

 

 

 

 

Gemmo.eu 2013

Augite

1.671

1.774

0.026

0.039

3.19

3.56

1.671

1.735

1.672

1.741

1.703

1.774

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

 

CAUSE OF COLOUR

MINERAL INCLUSIONS

LOCALITIES

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

Fe2O3

Augite

black

Bo Phloi

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

47.19

9.42

0.195

11.55

4.11

2.04

20.37

1.57

 

3.39

Augite

black

Bo Phloi

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

50.99

7.41

 

15.52

2.54

0.8

18.81

1.6

0.461

2.86

Augite

black

Bo Phloi

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

47.52

9.72

11.81

3.05

1.95

20.55

1.76

 

4.2

Augite

black

Den Chai

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

48.41

9.23

0.24

14.23

4.35

1.08

17.88

1.29

 

2.08

Augite

black

Den Chai

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

48.14

9.21

 

12.93

5.75

1.63

18.67

1.36

 

1.23

Augite

black

Den Chai

Thailand

The Australian Gemmologist 2009,Vol 23, N6 p244

48.55

9.17

0.23

13.98

3.08

1.28

18.23

1.64

 

3.75