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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

Tugtupite

1.485

1.485

 

 

2.29

2.29

purple

 

5.70ct

 

 

 

 

 

inert

bright orange

GJEPC-India, LAB INFORMATION CIRCULAR 2008 Volume 52 September

Tugtupite

1.494

1.504

0.004

0.007

2.27

2.44

light pink to dark red, white (no gem), light blue

Kvjanefeld, Greenland

 

1.498

1.504

1.494

1.497

 

dark red

red to light red, blue: light orange-yellow

Gems & Gemology 1982 summer, p90-94

Tugtupite

1.495

1.495

 

 

2.42

2.42

purple pink

 

2.40ct

 

 

 

 

 

bright glow of red

bright orange

GJEPC-India, LAB INFORMATION CIRCULAR 2008 Volume 52 September

Tugtupite

 

 

 

 

 

 

red

Greenland

1.22ct transparent

 

 

 

 

 

'crimson' red

weak 'salmon' pink

The Journal of Gemmology 2015 Vol 34, No.5, p396-397

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Tugtupite

1.49

1.502

0.006

0.008

2.3

2.57

1.500

1.502

1.490

1.496

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Tugtupite

1.49

1.503

0.005

0.005

2.27

2.45

 

 

 

 

Gemmo.eu 2017

Tugtupite

1.492

1.504

0.004

0.008

2.33

2.57

1.498

1.504

1.492

1.497

Gemmological Tables, Ulrich Henn, 2004 

Tugtupite

1.495

1.502

0.006

0.008

2.3

2.57

1.499

1.502

1.495

1.497

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

Tugtupite

1.496

1.502

0.006

0.008

2.3

2.57

1.502

1.502

1.496

1.496

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Tugtupite

1.496

1.502

0.006

0.006

2.3

2.57

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Tugtupite

1.496

1.502

0.006

0.008

2.3

2.57

 

 

 

 

http://www.gemmology.be 

Tugtupite

1.496

1.502

0.006

0.008

2.3

2.7

1.502

1.502

1.496

1.496

http://www.geminterest.com 

Tugtupite

1.496

1.502

0.006

0.006

2.36

2.57

 

 

 

 

Gems, R Webster, 5th edition 1994 

Tugtupite

1.496

1.502

0.006

0.008

2.3

2.57

 

 

 

 

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

Tugtupite

1.496

1.502

0.006

0.008

2.33

2.35

1.499

1.502

1.492

1.496

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp 

Tugtupite

 

 

 

 

2.28

2.28

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Tugtupite

pink

colour center(s) involving sulphur

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)