Tanzanite and Hibonite Optical Properties

Tanzanite

Hibonite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Present

O = brownish gray; E = gray

1.3 Dispersion

0.03NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Handbook of mineralogy (2001)

1.5 Refractive Index

1.685-1.7071.79-1.807

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Hexagonal

1.8 Birefringence

0.006-0.018Not Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Handbook of mineralogy (2001)

Tanzanite and Hibonite Optic Character

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

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