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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

Magnesioaxinite

1.656

1.669

0.013

0.013

3.16

3.16

pale brownish orange

Tanzania

1.52ct and 1.62ct, biaxial +

 

 

 

 

 

 

 

inert

weak orange

http://www.spec4gem.info/index.php 2017

Magnesioaxinite

1.656

1.668

0.012

0.012

3.178

3.178

pale blue

Tanzania

0.78ct

1.656

1.656

1.660

1.660

1.668

1.668

 

red

orange-red

The Journal of Gemmology 1975 N°8,p368-375

Magnesioaxinite

1.657

1.668

0.011

0.011

3.18

3.18

brownish yellow

Tanzania

 

 

 

 

 

 

 

 

weak orange

moderate orange

Gems & Gemology 2005 summer, p170

Magnesioaxinite

1.66

1.672

0.012

0.012

3.08

3.3

light bluish violet

Merelani, Tanzania

 

 

 

 

 

 

 

line at 410nm, weak cut off at 580nm

strong orangy pink

medium orange pink

Gems & Gemology 2007 winter , p374

Axinite

1.665

1.679

0.014

0.014

3.24

3.24

light blue

 

manganaxinite

1.665

1.665

1.672

1.672

1.679

1.679

 

 

 

Gems & Gemology 2008 spring p81

Axinite

1.668

1.68

0.009

0.012

3.28

3.3

medium brown to light brown, modified by strong pleochroism and colour zoning in reddish purple, orange red, blue to violet-green and pink

Taftan Mts, Pakistan

 

1.668

1.671

 

 

1.679

1.680

440, 470, 495, 515, 535

inert

inert

Gems & Gemology 2007 fall p 254-255

Ferroaxinite

1.668

1.68

0.012

0.012

3.2

3.2

 

Tanzania

 

 

 

 

 

 

 

 

inert

inert

Gems & Gemology 2007 winter p 374

Axinite

1.669

1.679

0.01

0.01

3.29

3.29

brownish

 

0.43ct

 

 

 

 

 

 

512nm line

inert

inert

ACAM lab  2299

Axinite

1.67

1.683

0.012

0.012

3.29

3.29

brown

 

1.6ct

1.670

1.670

1.679

1.679

1.683

1.683

512nm line

inert

inert

ACAM lab  1027

Axinite

1.67

1.681

0.011

0.011

3.2

3.2

brown

Baluchistan, Pakistan

4.18 and 4.56ct

 

 

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2013 62/1-2, Jun, p31-32

Axinite

1.67

1.69

0.02

0.02

3.28

3.29

 

Shigar Fort, Pakistan

cabochons, 6.57 and 5.79ct

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 2016 Vol 35, No.2, p96-97

Axinite

1.671

1.68

0.009

0.009

3.31

3.31

dark yellowish orange

Baja California, Mexico

4.29ct, biaxial -

 

 

 

 

 

 

446, 470, 492, 513

 

 

GIA Gem Database  33911

Ferroaxinite

1.675

1.685

0.01

0.01

3.314

3.314

cinnamon brown

Sri Lanka

2V : 69.5°

1.675

1.675

1.681

1.681

1.685

1.685

 

 

 

The Journal of Gemmology 1982 Vol18, N°1, p20-27

Axinite

1.675

1.684

0.009

0.009

3.31

3.31

dark yellowish orange

Baja California, Mexico

8.71ct

 

 

 

 

 

 

445, 480, 518, 538nm

 

 

GIA Gem Database  33910

Axinite

1.675

1.689

0.014

0.014

3.32

3.32

brown

 

 

 

 

 

 

 

 

weak 512 line

 

 

ACAM labo 

 

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

Magnesioaxinite

1.655

1.682

0.009

0.014

3.18

3.2

1.655

1.668

1.660

1.676

1.668

1.682

http://www.geminterest.com 

Axinite

1.656

1.693

0.01

0.012

3.17

3.31

1.656

1.683

 

 

1.668

1.693

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Axinite

1.656

1.695

0.009

0.012

3.18

3.32

1.656

1.683

1.660

1.693

1.668

1.695

Gemmological Tables, Ulrich Henn, 2004 

Magnesioaxinite

1.656

1.668

0.01

0.012

3.18

3.18

 

 

 

 

 

 

http://www.gemmology.be 

Magnesioaxinite

1.656

1.668

0.012

0.012

3.18

3.18

1.656

1.656

1.660

1.660

1.668

1.668

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Axinite

1.656

1.685

0.01

0.01

3.178

3.29

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Magnesioaxinite

1.656

1.672

0.009

0.012

3.08

3.3

1.656

1.660

 

 

1.668

1.672

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

Magnesioaxinite

1.658

1.668

0.012

0.012

3.18

3.18

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Axinite

1.665

1.704

0.009

0.014

3.18

3.36

1.665

1.693

1.672

1.701

1.679

1.704

http://www.geminterest.com 

Axinite

1.665

1.705

0.008

0.013

3.15

3.35

 

 

 

 

 

 

Gemmo.eu 

Ferroaxinite

1.668

1.685

0.01

0.012

3.2

3.32

1.668

1.675

1.679

1.681

1.682

1.685

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

Axinite

1.668

1.698

0.01

0.012

3.26

3.36

 

 

 

 

 

 

Gemology Tools Professional 2010

Axinite

1.672

1.69

0.01

0.012

3.25

3.3

1.672

1.678

 

 

1.684

1.690

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Axinite

1.673

1.704

0.01

0.012

3.26

3.36

1.673

1.693

 

 

1.683

1.704

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

Axinite

1.674

1.704

0.01

0.012

3.26

3.36

 

 

 

 

 

 

http://www.gemmology.be 

Axinite

1.674

1.704

0.01

0.012

3.26

3.36

1.674

1.693

1.681

1.701

1.684

1.704

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Axinite

1.674

1.704

0.01

0.012

3.26

3.36

1.674

1.693

1.681

1.701

1.684

1.704

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

Axinite

1.675

1.685

0.01

0.01

3.27

3.29

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Axinite

blue

+ in octahedral coordination

Gems & Gemology Summer 1988

Axinite

brown

Fe²+

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

goethite

Axinite -axinite group

Gemmological Tables, Ulrich Henn , GGA, 2004

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Ferroaxinite

 

Bourg d'Oisans

Isère

France

Joel Arem, Color Encyclopedia of Gemstones, 1987

Axinite

 

Taftan Mts

Balochistan (Baluchistan)

Pakistan

Gems & Gemology 2007 Fall, p 254-255

Ferroaxinite

Pouyva (Puiva) Mine, Saranpual, Polar Urals

Tyumenskaya Oblast'

Siberia

Russia

MinRec 30:465

Axinite

Pouyva (Puiva) Mine, Saranpual, Polar Urals

Tyumenskaya Oblast'

Siberia

Russia

Lapis 1/2003

Magnesioaxinite

Merelani Hills, Umba Valley

Lelatema Mts

Arusha region

Tanzania

www.mindat.org

Ferroaxinite

New Melones Lake

Calaveras County

California

USA

Joel Arem, Color Encyclopedia of Gemstones, 1987

Ferroaxinite

Coarsegold axinite locality - 5 miles NE of Coarsegold

Madera County

California

USA

http://www.mineralsocal.org/scfm/

Ferroaxinite

Piz Vallatscha

Medelsertal

Graubünden

Switzerland

Mineralienlexikon der Schweiz, Hans Anton Stalder e.a., 1998

 

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

V2O3

Fe2O3

K2O

ZnO

H2O

B2O3

Magnesioaxinite

 

New South Wales

Australia

The Journal of Gemmology 1982, Vol 18, N°1, p21

42.39

17.1

1.38

4.2

5.18

 

20.31

0.06

 

1.68

0.03

 

1.98

5.52

Ferroaxinite

 

Bourg d'Oisons

France

The Journal of Gemmology 1982, Vol 18, N°1, p21

42.2

17.5

3.3

1.6

6.1

0.03

20.1

0.04

 

 

0.02

 

 

 

axinite

light brown zone

Baluchistan

Pakistan

Gems & Gemology Fall 2007, 244-255

42.81

17.49

0.12

2.98

8.61

0.04

19.57

0.03

 

 

0.02

 

1.6

6.18

axinite

blue zone

Baluchistan

Pakistan

Gems & Gemology Fall 2007, 244-255

42.74

17.43

0.1

2.99

8.57

0.05

19.57

0.06

 

 

 

 

1.6

6.17

Ferroaxinite

cinnamon brown

 

Sri Lanka

The Journal of Gemmology 1982, Vol 18, N°1, p21

42.7

18.31

0.38

1.4

10.4

 

19.35

 

 

 

0.01

 

 

 

Ferroaxinite

brown

 

Tanzania

Gems & Gemology winter 2007, p 373-375

42.97

17.77

0.62

2.94

7.8

 

20.1

0.05

 

 

0.04

 

1.61

6.22

Magnesioaxinite

light bluish violet

 

Tanzania

Gems & Gemology winter 2007, p 373-375

43.84

18.56

1.99

6.27

0.05

 

20.46

0.02

 

 

0.02

 

1.64

6.35

Magnesioaxinite

 

 

Tanzania

The Journal of Gemmology 1982, Vol 18, N°1, p21

440

17.9

0.4

6.9

 

0.03

21.7

 

0.13

 

0.01

0.06