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Ruby
Ruby
☒

Sillimanite
Sillimanite
☒



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Ruby
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Sillimanite
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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous, Adamantine
Strong: purplish-red
0.02
Transparent, Translucent, Transparent to opaque
1.762-1.778
-
Trigonal
0.008
Transparent
 
Vitreous, Subadamantine, Silky
Colourless to pale brown to yellow
0.02
Transparent, Translucent
1.653-1.685
-
Orthorhombic
0.020-0.022
Transparent

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