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Tortoiseshell and Franklinite Optical Properties


Franklinite and Tortoiseshell Optical Properties


Optical Properties

Luster
Not Available   
Not Available   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Gemmological Tables (2004)   
Translucent   

Refractive Index
1.540-1.560   
Not Available   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m   

Birefringence
Not Available   
Not Available   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Translucent   

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Tortoiseshell and Franklinite Optic Character

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

Similar to their colors, Tortoiseshell and Franklinite 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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