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Pearl and Polyhalite Optical Properties


Polyhalite and Pearl Optical Properties


Optical Properties

Luster
Pearly   
Vitreous, Resinous   

Pleochroism
AbsentWalter Schumann   
Not Available   

Dispersion
None   
Not Available   

Transparency
Translucent, Opaque   
Not Available   

Refractive Index
1.52-1.66   
1.546-1.548   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Triclinic   

Birefringence
0.156   
0.021   

Clarity
Translucent   
Not Available   

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Pearl and Polyhalite Optic Character

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

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Pearl and Polyhalite Transparency

Similar to their colors, Pearl and Polyhalite 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, Pearl is Opaque and Translucent while Pearl is Opaque and Translucent in appearance.

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