Charoite and Brookite Optical Properties
Luster
Pearly, Fibrous, Chatoyant
Adamantine
Pleochroism
NilArthur Thomas
Very weak
Dispersion
Not Available
Not Available
Transparency
Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.545-1.560
2.583-2.741
Optic Character
Not Available
Not Available
Crystal System
Triclinic
Orthorhombic
Birefringence
0.009
0.117
Clarity
Translucent
Gemmological Tables (2004) More from other references
Charoite and Brookite Optic Character
Charoite and Brookite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Charoite and Brookite 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 Brookite 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 Brookite Transparency
Similar to their colors, Charoite and Brookite 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.