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Dravite and Rosasite Optical Properties


Rosasite and Dravite Optical Properties


Optical Properties

Luster
Vitreous   
Silky, Vitreous   

Pleochroism
Very strong: pale yellow colorless   
Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue   

Dispersion
0.02   
22
Not Available   

Transparency
Transparent   
Not Available   

Refractive Index
1.614-1.666   
1.672-1.688   

Optic Character
Not Available   
Not Available   

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

Birefringence
0.014-0.032   
0.139-0.143   

Clarity
Transparent   
Not Available   

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Dravite and Rosasite Optic Character

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

Similar to their colors, Dravite and Rosasite 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, Dravite is Transparent while Dravite is Transparent in appearance.

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