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Sillimanite
Sillimanite

Rubellite
Rubellite



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Sillimanite
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Rubellite

Sillimanite and Rubellite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Not Available
1.2 Pleochroism
Colourless to pale brown to yellow
Strong: dark red pinkish-redHerve Nicolas Lazzarelli
1.3 Dispersion
NA0.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Transparent, Translucent
1.5 Refractive Index
1.653-1.6851.614-1.666
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Not Available
1.8 Birefringence
0.020-0.0220.014-0.040
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Sillimanite and Rubellite Optic Character

Sillimanite and Rubellite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Sillimanite and Rubellite 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 Rubellite 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 Rubellite Transparency

Similar to their colors, Sillimanite and Rubellite 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 Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.