Almandine Garnet and Cordierite Iolite Optical Properties

Almandine Garnet

Cordierite Iolite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

Strong trichroism: colorless to yellowish

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Transparent

1.5 Refractive Index

1.780-1.8101.542-1.578

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 translucent

Transparent

Almandine Garnet and Cordierite Iolite Optic Character

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

Similar to their colors, Almandine 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, Almandine Garnet is Translucent, Transparent and Transparent to translucent while Almandine Garnet is Translucent, Transparent and Transparent to translucent in appearance.