Augite and Hibonite Optical Properties

Augite

Hibonite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous

1.2 Pleochroism

Pale green

O = brownish gray; E = gray

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Handbook of mineralogy (2001)

1.5 Refractive Index

1.671-1.7741.79-1.807

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

Handbook of mineralogy (2001)

Augite and Hibonite Optic Character

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

Similar to their colors, Augite and Hibonite 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, Augite is Translucent and Transparent while Augite is Translucent and Transparent in appearance.