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Sugilite
Sugilite

Alexandrite
Alexandrite



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Sugilite
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Alexandrite

Sugilite and Alexandrite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Weak
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent
Transparent, Transparent to nearly opaque
1.5 Refractive Index
1.607-1.6121.739-1.770
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Hexagonal
Orthorhombic
1.8 Birefringence
0.0030.007-0.010
Achroite
0 0.296
1.9 Clarity
Translucent
Transparent

Sugilite and Alexandrite Optic Character

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

Sugilite and Alexandrite Transparency

Similar to their colors, Sugilite and Alexandrite 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.