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Cordierite Iolite
Cordierite Iolite

Alexandrite
Alexandrite



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Cordierite Iolite
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Alexandrite

Cordierite Iolite and Alexandrite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Strong trichroism: colorless to yellowish
Not Available
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Transparent, Transparent to nearly opaque
1.5 Refractive Index
1.542-1.5781.739-1.770
Agate Opal
1 3.25
1.6 Optic Character
Biaxial/+
Biaxial/+
1.7 Crystal System
Not Available
Orthorhombic
1.8 Birefringence
0.008-0.0120.007-0.010
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Cordierite Iolite and Alexandrite Optic Character

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

Cordierite Iolite and Alexandrite Transparency

Similar to their colors, Cordierite Iolite and Alexandrite 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.