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Alexandrite
Alexandrite

Anhydrite
Anhydrite



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Alexandrite
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Anhydrite

Alexandrite and Anhydrite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Pearly, Greasy
1.2 Pleochroism
Not Available
For violet varieties
1.3 Dispersion
Albite Optical ..
Not Available
Rank: N/A (Overall)
0.01
Rank: 27 (Overall)
Fluorite Optical Properties
1.4 Transparency
Transparent, Transparent to nearly opaque
Transparent
1.5 Refractive Index
1.739-1.770
1.570-1.614
1.6 Optic Character
Biaxial/+
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.007-0.010
0.042-0.044
1.9 Clarity
Transparent
Transparent

Alexandrite and Anhydrite Optic Character

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

Alexandrite and Anhydrite Transparency

Similar to their colors, Alexandrite and Anhydrite 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, Alexandrite is Transparent and Transparent to nearly opaque while Alexandrite is Transparent and Transparent to nearly opaque in appearance.