Charoite and Manganotantalite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
  
Not Available
  
Pleochroism
NilArthur Thomas
  
Sometimes strongArthur Thomas
  
Dispersion
Not Available
  
Not Available
  
Transparency
Translucent
  
TransparentWalter Schumann, Gemstones of the world (2001) More from other references
  
Refractive Index
1.545-1.560
  
2.19-2.34
  
Optic Character
Not Available
  
Not Available
  
Crystal System
Triclinic
  
Not Available
  
Birefringence
0.009
  
0.015
  
Clarity
Translucent
  
TransparentWalter Schumann
  
Charoite and Manganotantalite Optic Character
Charoite and Manganotantalite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Manganotantalite 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 Manganotantalite 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 Manganotantalite Transparency
Similar to their colors, Charoite and Manganotantalite 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.