Hibonite and Dravite Optical Properties

Hibonite

Dravite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

O = brownish gray; E = gray

Very strong: pale yellow colorless

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Handbook of mineralogy (2001)

Transparent

1.5 Refractive Index

1.79-1.8071.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

Not Available0.014-0.032

0 0.296

1.9 Clarity

Handbook of mineralogy (2001)

Transparent

Hibonite and Dravite Optic Character

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

Similar to their colors, Hibonite and Dravite 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.