Andradite Garnet and Cordierite Iolite Optical Properties

Andradite Garnet

Cordierite Iolite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

Not Available

Strong trichroism: colorless to yellowish

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent, Opaque, Transparent to opaque

Transparent

1.5 Refractive Index

1.888-1.8891.542-1.578

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Isometric

Not Available

1.8 Birefringence

Not Available0.008-0.012

0 0.296

1.9 Clarity

Transparent to opaque

Transparent

Andradite Garnet and Cordierite Iolite Optic Character

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

Similar to their colors, Andradite Garnet 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, Andradite Garnet is Opaque, Transparent and Transparent to opaque while Andradite Garnet is Opaque, Transparent and Transparent to opaque in appearance.