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Demantoid and Dravite Optical Properties


Dravite and Demantoid Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
None   
Very strong: pale yellow colorless   

Dispersion
Not Available   
0.02   
22

Transparency
Gemmological Tables (2004)   
Transparent   

Refractive Index
1.880-1.890   
1.614-1.666   

Optic Character
Not Available   
Not Available   

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

Birefringence
Not Available   
0.014-0.032   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Transparent   

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Demantoid and Dravite Optic Character

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

Similar to their colors, Demantoid 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.

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