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Cordierite Iolite and Powellite Optical Properties


Powellite and Cordierite Iolite Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Subadamantine   

Pleochroism
Strong trichroism: colorless to yellowish   
In deeply colored specimens: blue greenAnthony et al   

Dispersion
0.02   
22
Not Available   

Transparency
Transparent   
Transparent   

Refractive Index
1.542-1.578   
1.974-1.984   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Not Available   
Not Available   

Birefringence
0.008-0.012   
Not Available   

Clarity
Transparent   
Transparent   

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Cordierite Iolite and Powellite Optic Character

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

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Cordierite Iolite and Powellite Transparency

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

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Blue Gemstones


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