Cordierite Iolite and Hureaulite Optical Properties

Cordierite Iolite

Hureaulite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Greasy

1.2 Pleochroism

Strong trichroism: colorless to yellowish

Colorless yellow to pale rose reddish yellow to reddish brown.Anthony et al

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.542-1.5781.647-1.667

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Not Available

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c

1.8 Birefringence

0.008-0.0120.012

0 0.296

1.9 Clarity

Transparent

Cordierite Iolite and Hureaulite Optic Character

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

Similar to their colors, Cordierite Iolite and Hureaulite 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.