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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

Siderite

1.6

 

 

 

3.9

3.9

dark brown

Brazil

high birefringence (spot reading)

 

 

 

 

 

 

 

Gems & Gemology 1970 summer, p182

Siderite

1.61

 

 

 

3.78

3.78

light brown

 

0.5ct

 

 

 

 

480nm line

 

 

ACAM lab 4738

Siderite

1.63

 

 

 

3.98

3.98

dark greenish yellow

Covilha, Castelo Branco, Portugal

2.65ct, transparent

 

 

 

 

broad absorption between 450-465, 485-495, 515-530; line at 475nm

inert

inert

GIA Gem Database  35505

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Siderite

1.592

1.875

0.224

0.242

3.7

3.96

1.592

1.633

1.816

1.875

http://www.geminterest.com 

Siderite

1.592

1.875

0.24

0.242

3.83

3.96

1.592

1.633

1.816

1.875

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

Siderite

1.61

1.876

0.235

0.245

3.8

3.97

 

 

 

 

Gemmo.eu 

Siderite

1.633

1.875

0.242

0.242

3.89

3.89

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Siderite

1.633

1.875

0.24

0.242

3.83

3.96

1.633

1.633

1.873

1.875

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

Siderite

1.633

1.875

0.24

0.24

3.83

3.89

1.633

1.635

1.873

1.875

Gemmological Tables, Ulrich Henn, 2004 

Siderite

1.633

1.873

0.24

0.24

3.83

3.96

 

 

 

 

http://www.gemmology.be 

Siderite

1.633

1.873

0.24

0.24

3.83

3.88

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Siderite

1.633

1.873

0.24

0.24

3.83

3.96

1.633

1.633

1.873

1.873

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Siderite

1.633

1.691

0.24

0.24

3.8

3.8

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Siderite

1.633

1.873

0.24

0.24

3.83

3.88

 

 

 

 

Gems, R Webster, 5th edition 1994 

Siderite

1.633

1.873

0.24

0.24

3.83

3.96

 

 

 

 

Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Siderite

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry)

Mont Saint-Hilaire, Rouville County

Quebec

Canada

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1994, Dez, p137

 

CHEMICAL DATA (%)