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Lazulite and Tortoiseshell Optical Properties


Tortoiseshell and Lazulite Optical Properties


Optical Properties

Luster
Not Available   
Not Available   

Pleochroism
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli   
Not Available   

Dispersion
0.01   
26
Not Available   

Transparency
Transparent, Translucent   
Gemmological Tables (2004)   

Refractive Index
1.604-1.646   
1.540-1.560   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Not Available   

Birefringence
0.031-0.036   
Not Available   

Clarity
Transparent   
OpaqueUlrich Henn and Claudio C. Milisenda   

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Lazulite and Tortoiseshell Optic Character

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

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Lazulite and Tortoiseshell Transparency

Similar to their colors, Lazulite and Tortoiseshell 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, Lazulite is Translucent and Transparent while Lazulite is Translucent and Transparent in appearance.

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