Spinel and Esperite Optical Properties

Spinel

Esperite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Absent

colorless.

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

OpaqueAnthony et al, Opaque, Transparent

1.5 Refractive Index

1.731.760-1.774

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

monoclinic

1.8 Birefringence

Not Available0.012

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

OpaqueAnthony et al

Spinel and Esperite Optic Character

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

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