Labradorite and Sillimanite Optical Properties

Labradorite

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous, Subadamantine, Silky

1.2 Pleochroism

From the Congo

Colourless to pale brown to yellow

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent, Translucent

1.5 Refractive Index

1.554-1.5731.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

Orthorhombic

1.8 Birefringence

0.008-0.0100.020-0.022

0 0.296

1.9 Clarity

Transparent

Labradorite and Sillimanite Optic Character

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

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Labradorite and Sillimanite Transparency

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