Tanzanite and Mottramite Optical Properties

Tanzanite

Mottramite

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Optical Properties

Luster

Vitreous

Greasy

Pleochroism

Present

Visible X=Y= canary yellow to greenish yellow

Dispersion

0.030.04

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.685-1.7072.170

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

0.006-0.0180.150

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Tanzanite and Mottramite Optic Character

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

Similar to their colors, Tanzanite and Mottramite 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, Tanzanite is Transparent, Translucent and Transparent to translucent while Tanzanite is Transparent, Translucent and Transparent to translucent in appearance.