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Sillimanite
Sillimanite

Labradorite
Labradorite



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Sillimanite
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Labradorite

Sillimanite and Labradorite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Vitreous, Pearly
1.2 Pleochroism
Colourless to pale brown to yellow
From the Congo
1.3 Dispersion
NA0.01
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Transparent, Translucent, Transparent to translucent
1.5 Refractive Index
1.653-1.6851.554-1.573
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Triclinic
1.8 Birefringence
0.020-0.0220.008-0.010
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Sillimanite and Labradorite Optic Character

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

Similar to their colors, Sillimanite and Labradorite 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.