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Mottramite
Mottramite

Topaz
Topaz



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Mottramite
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Topaz

Mottramite and Topaz Optical Properties

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Optical Properties

Luster

Greasy
Vitreous

Pleochroism

Visible X=Y= canary yellow to greenish yellow
Weak

Dispersion

0.040.01
0.005 1
👆🏻

Transparency

-
Transparent

Refractive Index

2.1701.606-1.644
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.1500.008-0.011
0 0.296
👆🏻

Clarity

-
TransparentUlrich Henn and Claudio C. Milisenda

Mottramite and Topaz Optic Character

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

Mottramite and Topaz Transparency

Similar to their colors, Mottramite and Topaz 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, Mottramite is while Mottramite is in appearance.