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Hibonite
Hibonite

Mottramite
Mottramite



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Hibonite
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Mottramite

Hibonite and Mottramite Optical Properties

Optical Properties

Luster

Vitreous
Greasy

Pleochroism

O = brownish gray; E = gray
Visible X=Y= canary yellow to greenish yellow

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

-
-

Refractive Index

1.79-1.8072.170
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Hexagonal
Orthorhombic

Birefringence

-99990.150
0 0.296
👆🏻

Clarity

-
-

Hibonite and Mottramite Optic Character

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

Hibonite and Mottramite Transparency

Similar to their colors, Hibonite 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, Hibonite is while Hibonite is in appearance.