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Grossular Garnet
Grossular Garnet

Opal
Opal



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Grossular Garnet
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Opal

Grossular Garnet and Opal Optical Properties

Optical Properties

Luster

Vitreous, Adamantine
Vitreous, Pearly

Pleochroism

-
None

Dispersion

0.030.01
0.005 1
👆🏻

Transparency

Transparent
Transparent, Translucent, Transparent to translucent

Refractive Index

1.738-1.7451.37-1.52
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Isometric
Trigonal

Birefringence

-9999-9999
0 0.296
👆🏻

Clarity

Transparent
Transparent

Grossular Garnet and Opal Optic Character

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

Grossular Garnet and Opal Transparency

Similar to their colors, Grossular Garnet 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, Grossular Garnet is Transparent while Grossular Garnet is Transparent in appearance.