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Cordierite Iolite and Dumortierite Optical Properties


Dumortierite and Cordierite Iolite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Strong trichroism: colorless to yellowish   
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   

Dispersion
0.02   
22
None   

Transparency
Transparent   
Translucent, Translucent to opaque   

Refractive Index
1.542-1.578   
1.669-1.723   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Not Available   
Orthorhombic   

Birefringence
0.008-0.012   
0.011-0.037   

Clarity
Transparent   
Translucent   

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Cordierite Iolite and Dumortierite Optic Character

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

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Cordierite Iolite and Dumortierite Transparency

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

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