Spinel and Agrellite Optical Properties

Spinel

Agrellite

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Optical Properties

Luster

Vitreous

Pearly

Pleochroism

Absent

colorless.

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.731.567

1 3.25

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Optic Character

Crystal System

Isometric

Triclinic

Birefringence

-99990.014

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Spinel and Agrellite Optic Character

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

Similar to their colors, Spinel and Agrellite 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.