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Petalite and Cordierite Iolite Optical Properties


Cordierite Iolite and Petalite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

Pleochroism
AbsentWalter Schumann   
Strong trichroism: colorless to yellowish   

Dispersion
0.01   
25
0.02   
22

Transparency
Gemmological Tables (2004) More from other references   
Transparent   

Refractive Index
1.502-1.523   
1.542-1.578   

Optic Character
Not Available   
Biaxial/+   

Crystal System
monoclinic   
Not Available   

Birefringence
0.012-0.016   
0.008-0.012   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Transparent   

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Petalite and Cordierite Iolite Optic Character

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

Similar to their colors, Petalite 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, Petalite is Gemmological Tables (2004) More from other references while Petalite is Gemmological Tables (2004) More from other references in appearance.

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