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Opal
Opal

Vishnevite
Vishnevite



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Opal
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Vishnevite

Opal and Vishnevite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Pearly
Vitreous, Pearly
1.2 Pleochroism
None
Not Available
1.3 Dispersion
NoneNA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to translucent
Not Available
1.5 Refractive Index
1.37-1.521.490-1.507
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Hexagonal
1.8 Birefringence
Not Available0.002-0.012
Achroite
0 0.296
1.9 Clarity
Transparent
Not Available

Opal and Vishnevite Optic Character

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

Opal and Vishnevite Transparency

Similar to their colors, Opal and Vishnevite 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, Opal is Translucent, Transparent and Transparent to translucent while Opal is Translucent, Transparent and Transparent to translucent in appearance.