Gemsdat
 

                Home            Gemstones

 

      

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

Coral imitation - Gilson

1.55

1.55

 

 

2.44

2.44

almost white, red-brown,

 

hardness 3.5, structure brecciated, toughness significantly less than coral, coloured effervescence by HCl, coloured streak

 

 

 

 

 

 

 

inert to strong purplish red

inert to strong purplish red

Gems & Gemology 1979 summer p179-185

 

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

Coral imitation - Gilson

1.486

1.658

0.172

0.172

2.44

2.46

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Coral imitation - Gilson

1.55

1.58

 

 

2.24

2.65

 

 

 

 

 

 

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

Coral imitation - Gilson

1.55

1.55

 

 

2.44

2.44

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

CHEMICAL DATA