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Melanite and Dravite Optical Properties


Dravite and Melanite Optical Properties


Optical Properties

Luster
Subadamantine, Vitreous   
Vitreous   

Pleochroism
Not Available   
Very strong: pale yellow colorless   

Dispersion
0.06   
7
0.02   
22

Transparency
Translucent   
Transparent   

Refractive Index
1.855-1.895   
1.614-1.666   

Optic Character
Not Available   
Not Available   

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

Birefringence
Not Available   
0.014-0.032   

Clarity
Translucent   
Transparent   

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Melanite and Dravite Optic Character

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

Similar to their colors, Melanite 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, Melanite is Translucent while Melanite is Translucent in appearance.

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