Spinel and Hibonite Optical Properties

Spinel

Hibonite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Absent

O = brownish gray; E = gray

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Handbook of mineralogy (2001)

1.5 Refractive Index

1.731.79-1.807

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Handbook of mineralogy (2001)

Spinel and Hibonite Optic Character

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

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