Iolite and Cordierite Optical Properties

Iolite

Cordierite

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1 Optical Properties

1.1 Luster

Vitreous

Greasy, Vitreous

1.2 Pleochroism

Not Available

X = pale yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Not Available

1.5 Refractive Index

1.52-1.56Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent to translucent

Not Available

Iolite and Cordierite Optic Character

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

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