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Amethyst
Amethyst
☒

Apophyllite
Apophyllite
☒



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Amethyst
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Apophyllite
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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, Pearly
Dichroic (colorless)
0.01
Transparent, Translucent
1.530-1.543
Uniaxial/-
tetragonal
0.000-0.003
Transparent

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Grossular
Hackmanite
Hackmanite
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