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Opal
Opal

Muscovite
Muscovite



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Opal
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Muscovite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Pearly
None
0.01
Transparent, Translucent, Transparent to translucent
1.37-1.52
-
Trigonal
-9999
Transparent
 
Vitreous, Silky, Pearly
Weak
0.02
Transparent
1.552-1.618
-
monoclinic
-9999
Transparent