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Pollucite
Pollucite

Opal
Opal



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Pollucite
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Opal

Pollucite and Opal Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous, Pearly

Pleochroism

-
None

Dispersion

0.010.01
0.005 1
👆🏻

Transparency

Transparent, Translucent
Transparent, Translucent, Transparent to translucent

Refractive Index

1.517-1.5251.37-1.52
1 3.25
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Optic Character

-
-

Crystal System

Isometric
Trigonal

Birefringence

-9999-9999
0 0.296
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Clarity

Transparent
Transparent

Pollucite and Opal Optic Character

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

Pollucite and Opal Transparency

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