Charoite and Dumortierite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Vitreous
Pleochroism
NilArthur Thomas
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Dispersion
Not Available
None
Transparency
Translucent
Translucent, Translucent to opaque
Refractive Index
1.545-1.560
1.669-1.723
Optic Character
Not Available
Not Available
Crystal System
Triclinic
Orthorhombic
Birefringence
0.009
0.011-0.037
Clarity
Translucent
Translucent
Charoite and Dumortierite Optic Character
Charoite and Dumortierite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Dumortierite 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 Dumortierite 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 Dumortierite Transparency
Similar to their colors, Charoite and Dumortierite 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.