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Prasiolite and Cordierite Iolite Optical Properties


Cordierite Iolite and Prasiolite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Very weak: light green pale greenWalter Schumann   
Strong trichroism: colorless to yellowish   

Dispersion
0.01   
27
0.02   
22

Transparency
Transparent, Translucent   
Transparent   

Refractive Index
1.544-1.553   
1.542-1.578   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Not Available   

Birefringence
0.009   
0.008-0.012   

Clarity
Transparent   
Transparent   

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Prasiolite and Cordierite Iolite Optic Character

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

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Prasiolite and Cordierite Iolite Transparency

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

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