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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

Ammolite

1.512

1.672

0.15

0.15

2.79

2.81

 

 

 

1.512

1.528

 

 

1.662

1.672

 

 

 

The Journal of Gemmology 1981 Vol 17, N6, p406-415

Ammolite

1.52

1.68

0.154

0.155

 

 

iridescence in red, orange, golden yellow, green and deep blue

Canada

 

1.520

1.525

1.671

1.674

1.674

1.680

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1996 Sep, p138-140

Ammolite

1.52

1.67

0.15

0.15

2.79

2.81

 

Alberta, Canada

hardness = 4

 

 

 

 

 

 

 

 

 

The Journal of Gemmology 1981 Vol 17, N6, p406-415

Ammolite

1.525

1.67

0.135

0.145

2.76

2.84

all colours, with red and green most abundant; blue is rare and purple extremely rare

 

normally opaque; transparent or translucent in very thin sheets; red is relatively tough, but blue and purple are brittle

1.525

1.530

 

 

1.665

1.670

 

iridescent is inert

iridescent is inert

Gems & Gemology 2001 spring, p4-25

 

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

Ammolite

1.520

1.670

0.150

0.150

2.800

2.950

 

 

 

 

 

 

http://www.gemmology.be 

Ammolite

1.520

1.670

0.150

0.150

2.800

2.950

1.520

1.520

 

 

1.670

1.670

http://www.geminterest.com 

Ammolite

1.520

1.670

0.150

0.150

2.800

2.800

1.520

1.520

 

 

1.670

1.670

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Ammolite

1.520

1.670

0.150

0.150

2.600

2.850

 

 

 

 

 

 

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

Ammolite

1.520

1.68

0.155

0.155

2.6

2.85

 

 

 

 

 

 

Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

pyriet

Ammolite

The Australian Gemmologist Nov 1987 p304

 

LOCALITIES