Labradorite and Alexandrite Optical Properties

Labradorite

Alexandrite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

From the Congo

Not Available

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent, Transparent to nearly opaque

1.5 Refractive Index

1.554-1.5731.739-1.770

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Triclinic

Orthorhombic

1.8 Birefringence

0.008-0.0100.007-0.010

0 0.296

1.9 Clarity

Transparent

Labradorite and Alexandrite Optic Character

Labradorite and Alexandrite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Labradorite and Alexandrite 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 Alexandrite 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. Alexandrite has Biaxial/+ character.

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Labradorite and Alexandrite Transparency

Similar to their colors, Labradorite and Alexandrite 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.