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Foitite and Sard Optical Properties


Sard and Foitite Optical Properties


Optical Properties

Luster
Vitreous   
Waxy   

Pleochroism
Strong: pale lavender dark blueAnthony et al   
AbsentWalter Schumann   

Dispersion
Not Available   
None   

Transparency
TranslucentAnthony et al, Translucent   
Translucent   

Refractive Index
Not Available   
1.535-1.539   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m   
Not Available   

Birefringence
Not Available   
0.008-0.010   

Clarity
TranslucentAnthony et al   
Translucent   

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Foitite and Sard Optic Character

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

Similar to their colors, Foitite and Sard 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, Foitite is Translucent and TranslucentAnthony et al while Foitite is Translucent and TranslucentAnthony et al in appearance.

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