Charoite and Cassiterite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Adamantine, Greasy
Pleochroism
NilArthur Thomas
Pleochroic haloes have been observed. Dichroic in yellow
Transparency
Translucent
Transparent, Translucent
Refractive Index
1.545-1.560
1.990-2.105
Optic Character
Not Available
Not Available
Crystal System
Triclinic
tetragonal
Birefringence
0.009
0.096-0.098
Clarity
Translucent
Transparent
Charoite and Cassiterite Optic Character
Charoite and Cassiterite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Cassiterite 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 Cassiterite 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 Cassiterite Transparency
Similar to their colors, Charoite and Cassiterite 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.