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Dioptase and Chrysoberyl Optical Properties


Chrysoberyl and Dioptase Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Weak; dark emerald green   
X = red; Y = yellow-orange; Z = emerald-green   

Dispersion
0.04   
13
0.02   
24

Transparency
TranslucentHerve Nicolas Lazzarelli   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.644-1.720   
1.746-1.763   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
0.051-0.053   
0.007-0.013   

Clarity
TranslucentHerve Nicolas Lazzarelli   
Transparent   

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Dioptase and Chrysoberyl Optic Character

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

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Dioptase and Chrysoberyl Transparency

Similar to their colors, Dioptase and Chrysoberyl 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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