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Dioptase and Alexandrite Optical Properties


Alexandrite and Dioptase Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Weak; dark emerald green   
Not Available   

Dispersion
0.04   
13
Not Available   

Transparency
TranslucentHerve Nicolas Lazzarelli   
Transparent, Transparent to nearly opaque   

Refractive Index
1.644-1.720   
1.739-1.770   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
0.051-0.053   
0.007-0.010   

Clarity
TranslucentHerve Nicolas Lazzarelli   
Transparent   

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Dioptase and Alexandrite Optic Character

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

Similar to their colors, Dioptase 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, Dioptase is TranslucentHerve Nicolas Lazzarelli while Dioptase is TranslucentHerve Nicolas Lazzarelli in appearance.

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