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Proustite and Alexandrite Optical Properties


Alexandrite and Proustite Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
Moderate; cochineal-red to blood-red   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references   
Transparent, Transparent to nearly opaque   

Refractive Index
2.792-3.087   
1.739-1.770   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
0.295-0.296   
0.007-0.010   

Clarity
OpaqueUlrich Henn and Claudio C. Milisenda   
Transparent   

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Proustite and Alexandrite Optic Character

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

Similar to their colors, Proustite 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, Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda while Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda in appearance.

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