Charoite and Grandidierite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Vitreous, Pearly
Pleochroism
NilArthur Thomas
visible
Dispersion
Not Available
Not Available
Transparency
Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.545-1.560
1.578-1.639
Optic Character
Not Available
Not Available
Crystal System
Triclinic
Orthorhombic
Birefringence
0.009
0.037-0.039
Clarity
Translucent
Gemmological Tables (2004) More from other references
Charoite and Grandidierite Optic Character
Charoite and Grandidierite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Grandidierite 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 Grandidierite 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 Grandidierite Transparency
Similar to their colors, Charoite and Grandidierite 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.