Spinel and Jet Optical Properties

Spinel

Jet

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1 Optical Properties

1.1 Luster

Vitreous

Waxy

1.2 Pleochroism

Absent

AbsentWalter Schumann

1.3 Dispersion

0.02None

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.731.640-1.680

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Amorphous

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Gemmological Tables (2004) More from other references

Spinel and Jet Optic Character

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

Similar to their colors, Spinel and Jet 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.