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Sillimanite
Sillimanite
☒

Plumbogummite
Plumbogummite
☒



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Sillimanite
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Plumbogummite
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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
 
Resinous
None
0.04
-
1.653-1.688
-
Trigonal
-9999
-

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