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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Location

Info

ne min

ne max

no min

no max

Spectrum

UVS

UVL

Reference

Sugilite

1.6

1.6

 

 

2.75

2.75

purple

Africa

slab, RI : hazy due to poor polish

 

 

 

 

line 419 nm

 

 

Gems & Gemology 1981 Summer, p105-106

Sugilite

1.607

1.609

 

 

2.76

2.8

violet, purplish red

Wessels mine, South-Africa

 

 

 

 

 

 

 

 

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1986 Jg 35, Nr 1-2, p65-67

Sugilite

1.607

1.607

 

 

2.74

2.8

bluish purple to purple to reddish purple

Wessels Mine, South Africa

 

 

 

 

 

bands at 411, 419 (most intense), 445, 495, broad regions of absorption below 430 and from 500 to 600nm

inert

inert

Gems & Gemology 1987 Summer, p78-89

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Sugilite

1.59

1.611

0.003

0.005

2.69

2.8

1.590

1.607

1.595

1.611

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

Sugilite

1.59

1.61

0.003

0.005

2.74

2.74

1.590

1.607

1.595

1.610

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Sugilite

1.59

1.61

0.002

0.005

2.73

2.75

1.590

1.607

1.595

1.610

http://www.geminterest.com 

Sugilite

1.59

1.595

0.003

0.005

2.74

2.74

 

 

 

 

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

Sugilite

1.59

1.612

0.002

0.005

2.72

2.84

 

 

 

 

Gemmo.eu 2013

Sugilite

1.595

1.607

0.003

0.005

2.72

2.75

 

 

 

 

http://www.gemmology.be 

Sugilite

1.605

1.611

0

0.003

2.74

2.79

 

 

 

 

Gemology Tools Professional 2010

Sugilite

1.606

1.611

0.003

0.005

2.69

2.79

1.606

1.607

1.610

1.611

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

Sugilite

1.607

1.61

0.003

0.003

2.74

2.8

1.607

1.607

1.610

1.610

Gemmological Tables, Ulrich Henn, 2004 

Sugilite

1.607

1.61

0.004

0.004

2.74

2.74

 

 

 

 

Gems, R Webster, 5th edition 1994 

Sugilite

1.607

1.611

0.001

0.004

2.69

2.79

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Sugilite

purple

Mn³+ and Fe³+ presumably in octahedral coordination

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Sugilite

Wessels Mine, Hotazel

Kalahari manganese fields

Northern Cape Province

South Africa

Gems & Gemology Summer 1988

 

CHEMICAL DATA (%)