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Topaz and Omphacite Optical Properties


Omphacite and Topaz Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Weak   
Weak: colorless -- very pale green -- very pale green   

Dispersion
0.01   
26
Not Available   

Transparency
Transparent   
TranslucentAnthony et al, Handbook of mineralogy (2001)   

Refractive Index
1.606-1.644   
1.662-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Not Available   

Birefringence
0.008-0.011   
Not Available   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
TranslucentAnthony et al   

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Topaz and Omphacite Optic Character

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

Similar to their colors, Topaz and Omphacite 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, Topaz is Transparent while Topaz is Transparent in appearance.

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