Home
Gemstones


Dravite and Dumortierite Optical Properties


Dumortierite and Dravite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Very strong: pale yellow colorless   
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   

Dispersion
0.02   
22
None   

Transparency
Transparent   
Translucent, Translucent to opaque   

Refractive Index
1.614-1.666   
1.669-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m   
Orthorhombic   

Birefringence
0.014-0.032   
0.011-0.037   

Clarity
Transparent   
Translucent   

Benefits >>
<< Physical Properties

Dravite and Dumortierite Optic Character

Dravite and Dumortierite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Dravite and Dumortierite 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 Dravite and Dumortierite 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.

Compare Blue Gemstones

Dravite and Dumortierite Transparency

Similar to their colors, Dravite and Dumortierite 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, Dravite is Transparent while Dravite is Transparent in appearance.

Blue Gemstones

Blue Gemstones


Compare Blue Gemstones