Labradorite and Mottramite Optical Properties

Labradorite

Mottramite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Greasy

1.2 Pleochroism

From the Congo

Visible X=Y= canary yellow to greenish yellow

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Not Available

1.5 Refractive Index

1.554-1.5732.170

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

Orthorhombic

1.8 Birefringence

0.008-0.0100.150

0 0.296

1.9 Clarity

Transparent

Not Available

Labradorite and Mottramite Optic Character

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

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