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Zinnwaldite
Zinnwaldite
☒

Heliotrope
Heliotrope
☒



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Zinnwaldite
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Heliotrope
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Pearly, Vitreous
Distinct
0.02
-
1.565-1.625
-
monoclinic
0.040-0.050
-
 
Vitreous
-
0.01
-
1.53-1.54
-
Trigonal
0.004
-

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