Iolite and Agrellite Optical Properties

Iolite

Agrellite

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous

Pearly

1.2 Pleochroism

Not Available

colorless.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Not Available

1.5 Refractive Index

1.52-1.561.567

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Triclinic

1.8 Birefringence

Not Available0.014

0 0.296

1.9 Clarity

Transparent to translucent

Not Available

Iolite and Agrellite Optic Character

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

Compare Gems for Taurus » More

Iolite Vs Carnelian

Iolite Vs Quartz Rose

Iolite Vs Chrysocolla

» More

More Compare Gems for Taurus

Iolite and Agrellite Transparency

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