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Charoite and Dravite Optical Properties


Dravite and Charoite Optical Properties


Optical Properties

Luster
Pearly, Fibrous, Chatoyant   
Vitreous   

Pleochroism
NilArthur Thomas   
Very strong: pale yellow colorless   

Dispersion
Not Available   
0.02   
22

Transparency
Translucent   
Transparent   

Refractive Index
1.545-1.560   
1.614-1.666   

Optic Character
Not Available   
Not Available   

Crystal System
Triclinic   
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m   

Birefringence
0.009   
0.014-0.032   

Clarity
Translucent   
Transparent   

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Charoite and Dravite Optic Character

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

Similar to their colors, Charoite and Dravite 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, Charoite is Translucent while Charoite is Translucent in appearance.

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