Iolite and Tantalite Optical Properties

Iolite

Tantalite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentWalter Schumann, Gemstones of the world (2001) More from other references

1.5 Refractive Index

1.52-1.562.190-2.457

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

Not Available0.083

0 0.296

1.9 Clarity

Transparent to translucent

TransparentWalter Schumann

Iolite and Tantalite Optic Character

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

Similar to their colors, Iolite and Tantalite 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.