Sapphire and Mottramite Optical Properties

Sapphire

Mottramite

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine, Vitreous, Adamantine

Greasy

1.2 Pleochroism

Strong

Visible X=Y= canary yellow to greenish yellow

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to opaque

Not Available

1.5 Refractive Index

1.762-1.7882.170

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.008-0.0090.150

0 0.296

1.9 Clarity

Transparent

Not Available

Sapphire and Mottramite Optic Character

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

Similar to their colors, Sapphire 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, Sapphire is Translucent, Transparent and Transparent to opaque while Sapphire is Translucent, Transparent and Transparent to opaque in appearance.