Hibonite and Esperite Optical Properties

Hibonite

Esperite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

O = brownish gray; E = gray

colorless.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Handbook of mineralogy (2001)

OpaqueAnthony et al, Opaque, Transparent

1.5 Refractive Index

1.79-1.8071.760-1.774

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

monoclinic

1.8 Birefringence

Not Available0.012

0 0.296

1.9 Clarity

Handbook of mineralogy (2001)

OpaqueAnthony et al

Hibonite and Esperite Optic Character

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

Similar to their colors, Hibonite and Esperite 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 Handbook of mineralogy (2001) while Hibonite is Handbook of mineralogy (2001) in appearance.