Iolite and Umbalite Optical Properties

Iolite

Umbalite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.52-1.561.730-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent to translucent

TransparentGemdat.org

Iolite and Umbalite Optic Character

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

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Iolite and Umbalite Transparency

Similar to their colors, Iolite and Umbalite 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.