Iolite and Danburite Optical Properties

Iolite

Danburite

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Optical Properties

Luster

Vitreous

Vitreous, Greasy

Pleochroism

Weak: pale yellow yellow

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.52-1.561.627-1.639

1 3.25

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Optic Character

Biaxial/+

Crystal System

Orthorhombic

Birefringence

-99990.006

0 0.296

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Clarity

Transparent to translucent

TransparentUlrich Henn and Claudio C. Milisenda

Iolite and Danburite Optic Character

Iolite and Danburite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Iolite and Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

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Iolite and Danburite Transparency

Similar to their colors, Iolite and Danburite 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.