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Chalcedony
Chalcedony

Lazulite
Lazulite



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Chalcedony
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Lazulite
Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
-
0.01
Translucent, Translucent to opaque
1.530-1.543
-
Trigonal
0.003-0.009
Translucent
 
-
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli
0.01
Transparent, Translucent
1.604-1.646
-
monoclinic
0.031-0.036
Transparent