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Alexandrite
Alexandrite

Lazurite
Lazurite



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Alexandrite
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Lazurite

Alexandrite and Lazurite Optical Properties

Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
-
0.02
Transparent, Transparent to nearly opaque
1.739-1.770
Biaxial/+
Orthorhombic
0.007-0.010
Transparent
 
Vitreous
-
0.02
-
1.500
-
Isometric
-9999
-

Alexandrite and Lazurite Optic Character

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

Similar to their colors, Alexandrite and Lazurite 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 while Alexandrite is in appearance.