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Amethyst
Amethyst

Fluorapatite
Fluorapatite



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Amethyst
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Fluorapatite
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, Resinous
Weak to strong if coloreD
0.03
Transparent
1.631-1.650
-
Hexagonal
-9999
Transparent