Spinel and Herderite Optical Properties

Spinel

Herderite

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Optical Properties

Luster

Vitreous

Pleochroism

Absent

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Transparent

Refractive Index

1.731.587-1.642

1 3.25

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Optic Character

Biaxial/+

Crystal System

Isometric

monoclinic

Birefringence

-99990.028-0.032

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Spinel and Herderite Optic Character

Spinel and Herderite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Spinel and Herderite 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 Spinel and Herderite 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. Herderite has Biaxial/+ character.

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Spinel and Herderite Transparency

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