Charoite and Holmquistite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Vitreous
Pleochroism
NilArthur Thomas
Strong in shades of violet when dark-colored.Anthony et al
Dispersion
Not Available
Not Available
Transparency
Translucent
Transparent
Refractive Index
1.545-1.560
1.622-1.666
Optic Character
Not Available
Not Available
Crystal System
Triclinic
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Birefringence
0.009
Not Available
Clarity
Translucent
Transparent
Charoite and Holmquistite Optic Character
Charoite and Holmquistite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Holmquistite 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 Holmquistite 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 Holmquistite Transparency
Similar to their colors, Charoite and Holmquistite 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.