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Alexandrite
Alexandrite

Actinolite
Actinolite



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Alexandrite
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Actinolite

Alexandrite and Actinolite Optical Properties

Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

-
moderate

Dispersion

0.020.02
0.005 1
👆🏻

Transparency

Transparent, Transparent to nearly opaque
TransparentUlrich Henn and Claudio C. Milisenda

Refractive Index

1.739-1.7701.613-1.628
1 3.25
👆🏻

Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
monoclinic

Birefringence

0.007-0.0100.0250-0.0270
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Alexandrite and Actinolite Optic Character

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

Similar to their colors, Alexandrite and Actinolite 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.