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Sapphire and Stibiotantalite Optical Properties


Stibiotantalite and Sapphire Optical Properties


Optical Properties

Luster
Vitreous, Adamantine, Vitreous, Adamantine   
Adamantine   

Pleochroism
Strong   
Not Available   

Dispersion
0.02   
21
Not Available   

Transparency
Transparent, Translucent, Transparent to opaque   
Gemmological Tables (2004) More from other references   

Refractive Index
1.762-1.788   
2.37-2.45   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Not Available   

Birefringence
0.008-0.009   
0.08   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Sapphire and Stibiotantalite Optic Character

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

Similar to their colors, Sapphire and Stibiotantalite 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, Sapphire is Translucent, Transparent and Transparent to opaque while Sapphire is Translucent, Transparent and Transparent to opaque in appearance.

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