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Sillimanite
Sillimanite
☒

Common Opal
Common Opal
☒



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Sillimanite
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Common Opal
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Subadamantine, Silky
Colourless to pale brown to yellow
0.02
Transparent, Translucent
1.653-1.685
-
Orthorhombic
0.020-0.022
Transparent
 
-
-
0.01
Translucent
1.37-1.52
-
-
-9999
Translucent

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