Cordierite Iolite and Clinochlore Optical Properties

Cordierite Iolite

Clinochlore

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1 Optical Properties

1.1 Luster

Vitreous

Pearly, Greasy

1.2 Pleochroism

Strong trichroism: colorless to yellowish

Distinct: light yellow-green to light bluE

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.542-1.5781.571-1.597

1 3.25

1.6 Optic Character

Biaxial/+

1.7 Crystal System

Not Available

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

1.8 Birefringence

0.008-0.012Not Available

0 0.296

1.9 Clarity

Transparent

Cordierite Iolite and Clinochlore Optic Character

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

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Cordierite Iolite and Clinochlore Transparency

Similar to their colors, Cordierite Iolite and Clinochlore 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.