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Alexandrite
Alexandrite

Rhodolite
Rhodolite



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Alexandrite
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Rhodolite

Alexandrite and Rhodolite Optical Properties

Optical Properties

Luster

Vitreous
Greasy, Vitreous

Pleochroism

-
None

Dispersion

0.020.03
0.005 1
👆🏻

Transparency

Transparent, Transparent to nearly opaque
-

Refractive Index

1.739-1.7701.760
1 3.25
👆🏻

Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
cubic

Birefringence

0.007-0.0100.010-0.014
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Alexandrite and Rhodolite Optic Character

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

Alexandrite and Rhodolite Transparency

Similar to their colors, Alexandrite and Rhodolite 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, Alexandrite is Transparent and Transparent to nearly opaque while Alexandrite is Transparent and Transparent to nearly opaque in appearance.