Andesine and Sugilite Optical Properties

Andesine

Sugilite

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Optical Properties

Luster

Vitreous

Pleochroism

colorless.

Weak

Dispersion

0.700.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Translucent

Refractive Index

1.543-1.5641.607-1.612

1 3.25

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Optic Character

Biaxial/+

Crystal System

Triclinic

Hexagonal

Birefringence

0.007-0.0110.003

0 0.296

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Clarity

Transparent

Translucent

Andesine and Sugilite Optic Character

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

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Andesine and Sugilite Transparency

Similar to their colors, Andesine and Sugilite 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, Andesine is Transparent, Translucent and Transparent to translucent while Andesine is Transparent, Translucent and Transparent to translucent in appearance.