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Vishnevite and Petalite Optical Properties


Petalite and Vishnevite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous, Pearly   

Pleochroism
Not Available   
AbsentWalter Schumann   

Dispersion
Not Available   
0.01   
25

Transparency
Not Available   
Gemmological Tables (2004) More from other references   

Refractive Index
1.490-1.507   
1.502-1.523   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
monoclinic   

Birefringence
0.002-0.012   
0.012-0.016   

Clarity
Not Available   
TransparentUlrich Henn and Claudio C. Milisenda   

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Vishnevite and Petalite Optic Character

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

Similar to their colors, Vishnevite and Petalite 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, Vishnevite is Not Available while Vishnevite is Not Available in appearance.

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