Spinel and Cobaltite Optical Properties

Spinel

Cobaltite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Absent

Very weak

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gems

1.5 Refractive Index

1.73Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: P ca21

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Gems

Spinel and Cobaltite Optic Character

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

Similar to their colors, Spinel and Cobaltite 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.