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Sillimanite
Sillimanite

Baddeleyite
Baddeleyite



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Sillimanite
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Baddeleyite

Sillimanite and Baddeleyite Optical Properties

Optical Properties

Luster

Vitreous, Subadamantine, Silky
Adamantine

Pleochroism

Colourless to pale brown to yellow
DistinctArthur Thomas

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

Transparent, Translucent
Transparent

Refractive Index

1.653-1.6852.13-2.20
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/c

Birefringence

0.020-0.0220.07
0 0.296
👆🏻

Clarity

Transparent
Transparent

Sillimanite and Baddeleyite Optic Character

Sillimanite and Baddeleyite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Sillimanite and Baddeleyite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Sillimanite and Baddeleyite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

Sillimanite and Baddeleyite Transparency

Similar to their colors, Sillimanite and Baddeleyite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Sillimanite is Transparent and Translucent while Sillimanite is Transparent and Translucent in appearance.