Fluorite and Iolite Optical Properties

Fluorite

Iolite

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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

Vitreous

0.01

Transparent, Translucent, Transparent to translucent

1.432-1.436

cubic

-9999

Transparent

Vitreous

0.02

Transparent, Translucent, Transparent to translucent

1.52-1.56

Orthorhombic

-9999

Transparent to translucent

Fluorite and Iolite Optic Character

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

Similar to their colors, Fluorite and Iolite 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, Fluorite is Transparent, Translucent and Transparent to translucent while Fluorite is Transparent, Translucent and Transparent to translucent in appearance.