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Spinel and Realgar Optical Properties


Realgar and Spinel Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
Absent   
Nearly colorless to pale golden yellowAnthony et al   

Dispersion
0.02   
18
Not Available   

Transparency
Transparent, Translucent, Transparent to translucent   
Gems   

Refractive Index
1.73   
2.538-2.704   

Optic Character
Not Available   
Not Available   

Crystal System
Isometric   
Not Available   

Birefringence
Not Available   
0.166   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Gems   

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Spinel and Realgar Optic Character

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

Similar to their colors, Spinel and Realgar 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.

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