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INVESTIGATIONS

 

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

Boracite

2.96

2.96

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Boracite

1.658

1.672

0.01

0.011

2.95

2.96

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Boracite

1.658

1.673

0.011

0.011

2.95

2.95

1.658

1.662

1.662

1.667

1.668

1.673

http://www.geminterest.com 

Boracite

1.658

1.693

0.01

0.011

2.95

2.96

1.658

1.662

 

 

1.688

1.693

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

Boracite

1.658

1.673

0.01

0.011

2.9

3

1.658

1.662

1.662

1.667

1.668

1.673

Gemmological Tables, Ulrich Henn, 2004 

Boracite

1.658

1.673

0.011

0.011

2.95

2.95

 

 

 

 

 

 

http://www.gemmology.be 

Boracite

1.658

1.673

0.011

0.011

2.95

2.95

1.658

1.662

1.662

1.667

1.668

1.673

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Boracite

1.658

1.673

0.01

0.011

2.86

3.1

1.658

1.662

1.662

1.667

1.668

1.673

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

Boracite

1.661

1.671

0

0

2.96

2.96

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Boracite

1.661

1.671

0

0

2.96

2.96

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Boracite

 

Hannover

Niedersachsen

Germany

Joel Arem, Color Encyclopedia of Gemstones, 1987

Boracite

 

Stassfurt

Sachsen-Anhalt

Germany

Joel Arem, Color Encyclopedia of Gemstones, 1987

 

CHEMICAL DATA