Charoite and Bertrandite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Vitreous
Pleochroism
NilArthur Thomas
none.
Dispersion
Not Available
Not Available
Transparency
Translucent
TransparentAnthony et al, Handbook of mineralogy (2001)
Refractive Index
1.545-1.560
1.583-1.614
Optic Character
Not Available
Not Available
Crystal System
Triclinic
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Birefringence
0.009
Not Available
Clarity
Translucent
TransparentAnthony et al
Charoite and Bertrandite Optic Character
Charoite and Bertrandite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Bertrandite 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 Bertrandite 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 Bertrandite Transparency
Similar to their colors, Charoite and Bertrandite 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.