Gemsdat
 

                Home            Gemstones

 

      

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

Fresnoite

1.765

1.773

0.008

0.008

4.51

4.6

 

 

 

 

 

 

 

447nm line

strong , slightly chalky whitish yellow

inert

Gems & Gemology 2000 Fall p264-2.65

Synthetic fresnoite

1.765

1.775

0.01

0.01

4.45

4.45

orange

 

6.11ct

 

 

 

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1999 Dec, p232

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Fresnoite

1.765

1.773

0.008

0.008

4.5

4.6

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Fresnoite

1.765

1.775

0.008

0.01

4.45

4.6

 

 

 

 

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

Synthetic fresnoite

1.765

1.775

0.01

0.01

4.45

4.45

1.765

1.765

1.775

1.775

Gemmological Tables, Ulrich Henn, 2004 

Synthetic fresnoite

1.765

1.775

0.01

0.01

4.45

4.45

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Synthetic fresnoite

1.765

1.775

0.01

0.01

4.45

4.45

 

 

 

 

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA