Spinel and Umbalite Optical Properties

Spinel

Umbalite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Absent

Not Available

1.3 Dispersion

0.020.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentGemdat.org, Management Team (2012)

1.5 Refractive Index

1.731.730-1.820

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TransparentGemdat.org

Spinel and Umbalite Optic Character

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

Similar to their colors, Spinel and Umbalite 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.