Norbergite and Hibonite Optical Properties

Norbergite

Hibonite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Pale yellow very pale yellow colorlessAnthony et al

O = brownish gray; E = gray

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Handbook of mineralogy (2001)

1.5 Refractive Index

1.563-1.5931.79-1.807

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

Handbook of mineralogy (2001)

Norbergite and Hibonite Optic Character

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

Similar to their colors, Norbergite 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, Norbergite is Transparent while Norbergite is Transparent in appearance.