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Tortoiseshell and Herderite Optical Properties


Herderite and Tortoiseshell Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Gemmological Tables (2004)   
Transparent   

Refractive Index
1.540-1.560   
1.587-1.642   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Not Available   
monoclinic   

Birefringence
Not Available   
0.028-0.032   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Transparent   

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Tortoiseshell and Herderite Optic Character

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

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Tortoiseshell and Herderite Transparency

Similar to their colors, Tortoiseshell and Herderite 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, Tortoiseshell is Gemmological Tables (2004) while Tortoiseshell is Gemmological Tables (2004) in appearance.

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