Charoite and Polyhalite Optical Properties
Luster
Pearly, Chatoyant
Vitreous, Resinous
Transparency
Translucent
-
Refractive Index
1.545-1.560
1.546-1.548
Crystal System
Triclinic
Triclinic
Birefringence
0.009
0.021
Charoite and Polyhalite Optic Character
Charoite and Polyhalite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Polyhalite 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 Polyhalite 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 Polyhalite Transparency
Similar to their colors, Charoite and Polyhalite 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.