Charoite and Dravite Optical Properties
Luster
Pearly, Chatoyant
Vitreous
Pleochroism
-
Very strong: pale yellow colorless
Transparency
Translucent
Transparent
Refractive Index
1.545-1.560
1.614-1.666
Crystal System
Triclinic
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
0.009
0.014-0.032
Clarity
Translucent
Transparent
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.
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.