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Pietersite and Alexandrite Optical Properties


Alexandrite and Pietersite Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Transparent, Transparent to nearly opaque   

Refractive Index
1.54-1.56   
1.739-1.770   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
Not Available   
0.007-0.010   

Clarity
Not Available   
Transparent   

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Pietersite and Alexandrite Optic Character

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

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Pietersite and Alexandrite Transparency

Similar to their colors, Pietersite 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, Pietersite is Not Available while Pietersite is Not Available in appearance.

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