Hibonite and Bertrandite Optical Properties

Hibonite

Bertrandite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

O = brownish gray; E = gray

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Handbook of mineralogy (2001)

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.79-1.8071.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Handbook of mineralogy (2001)

TransparentAnthony et al

Hibonite and Bertrandite Optic Character

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

Similar to their colors, Hibonite and Bertrandite 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.