Iolite and Powellite Optical Properties

Iolite

Powellite

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Optical Properties

Luster

Vitreous

Greasy, Subadamantine

Pleochroism

In deeply colored specimens: blue greenAnthony et al

Dispersion

0.020.03

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Transparent

Refractive Index

1.52-1.561.974-1.984

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

-9999-9999

0 0.296

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Clarity

Transparent to translucent

Transparent

Iolite and Powellite Optic Character

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

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