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Sugilite
Sugilite

Tortoiseshell
Tortoiseshell



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Sugilite
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Tortoiseshell

Sugilite and Tortoiseshell Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Not Available
1.2 Pleochroism
Weak
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent
Gemmological Tables (2004)
1.5 Refractive Index
1.607-1.6121.540-1.560
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
Not Available
1.8 Birefringence
0.003Not Available
Achroite
0 0.296
1.9 Clarity
Translucent
OpaqueUlrich Henn and Claudio C. Milisenda

Sugilite and Tortoiseshell Optic Character

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

Sugilite and Tortoiseshell Transparency

Similar to their colors, Sugilite 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, Sugilite is Translucent while Sugilite is Translucent in appearance.