Iolite and Apophyllite Optical Properties

Iolite

Apophyllite

Add ⊕

Optical Properties

Luster

Vitreous

Vitreous, Pearly

Pleochroism

Dichroic (colorless)

Dispersion

0.020.01

0.005 1

👆🏻

Transparency

Transparent, Translucent, Transparent to translucent

Transparent, Translucent

Refractive Index

1.52-1.561.530-1.543

1 3.25

👆🏻

Optic Character

Uniaxial/-

Crystal System

Orthorhombic

tetragonal

Birefringence

-99990.000-0.003

0 0.296

👆🏻

Clarity

Transparent to translucent

Transparent

Iolite and Apophyllite Optic Character

Iolite and Apophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Iolite and Apophyllite 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 Iolite and Apophyllite 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. Apophyllite has Uniaxial/- character.

Compare Gems for Taurus » More

Iolite Vs Copper

Iolite Vs Quartz Rose

Iolite Vs Sapphire

» More Compare Gems for Taurus

Iolite and Apophyllite Transparency

Similar to their colors, Iolite and Apophyllite 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, Iolite is Transparent, Translucent and Transparent to translucent while Iolite is Transparent, Translucent and Transparent to translucent in appearance.