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Heliotrope
Heliotrope
☒

Nuummite
Nuummite
☒



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Heliotrope
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Nuummite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
-
0.01
-
1.53-1.54
-
Trigonal
0.004
-
 
-
-
0.02
-
1.635-1.663
-
-
0.0170-0.230
-

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Flint
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Zinnwaldite
Nuummite Vs Zinnwaldite

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