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Taaffeite
Taaffeite

Alexandrite
Alexandrite



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Taaffeite
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Alexandrite

Taaffeite and Alexandrite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Weak
Not Available
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Gemmological Tables (2004) More from other references
Transparent, Transparent to nearly opaque
1.5 Refractive Index
1.70-1.731.739-1.770
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Hexagonal
Orthorhombic
1.8 Birefringence
0.0550.007-0.010
Achroite
0 0.296
1.9 Clarity
Color grading system
Transparent

Taaffeite and Alexandrite Optic Character

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

Taaffeite and Alexandrite Transparency

Similar to their colors, Taaffeite 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, Taaffeite is Gemmological Tables (2004) More from other references while Taaffeite is Gemmological Tables (2004) More from other references in appearance.