Hibonite and Crocoite Optical Properties

Hibonite

Crocoite

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1 Optical Properties

1.1 Luster

Vitreous

Adamantine

1.2 Pleochroism

O = brownish gray; E = gray

Distinctly trichroic

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Handbook of mineralogy (2001)

Transparent

1.5 Refractive Index

1.79-1.8072.31-2.66

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/n

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Handbook of mineralogy (2001)

Transparent

Hibonite and Crocoite Optic Character

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

Similar to their colors, Hibonite and Crocoite 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.