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Mottramite and Tortoiseshell Optical Properties


Tortoiseshell and Mottramite Optical Properties


Optical Properties

Luster
Greasy   
Not Available   

Pleochroism
Visible X=Y= canary yellow to greenish yellow   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Gemmological Tables (2004)   

Refractive Index
2.170   
1.540-1.560   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Not Available   

Birefringence
0.150   
Not Available   

Clarity
Not Available   
OpaqueUlrich Henn and Claudio C. Milisenda   

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Mottramite and Tortoiseshell Optic Character

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

Similar to their colors, Mottramite 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, Mottramite is Not Available while Mottramite is Not Available in appearance.

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