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Amethyst
Amethyst

Ekanite
Ekanite



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Amethyst
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Ekanite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
None
0.01
Transparent, Transparent to translucent
1.544-1.553
-
Trigonal
0.009
Transparent
 
Vitreous
-
0.03
Transparent
1.593-1.596
-
Tetragonal Trapezohedral H-M Symbol (4 2 2) Space Group: I 422
0.001
Transparent