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Benitoite
Benitoite

Grossular
Grossular



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Benitoite
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Grossular

Benitoite and Grossular Optical Properties

Optical Properties

Luster

Vitreous
Greasy, Vitreous

Pleochroism

O = colorless; E = purple
None

Dispersion

0.040.02
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.757-1.8041.730-1.760
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Hexagonal
cubic

Birefringence

0.0470.020
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Benitoite and Grossular Optic Character

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

Benitoite and Grossular Transparency

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