Home
Gemstones


Black Opal and Dumortierite Optical Properties


Dumortierite and Black Opal Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
AbsentWalter Schumann   
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   

Dispersion
None   
None   

Transparency
Transparent, Translucent   
Translucent, Translucent to opaque   

Refractive Index
1.370-1.470   
1.669-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Orthorhombic   

Birefringence
Not Available   
0.011-0.037   

Clarity
Transparent   
Translucent   

Benefits >>
<< Physical Properties

Black Opal and Dumortierite Optic Character

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

Black Opal and Dumortierite Transparency

Similar to their colors, Black Opal 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, Black Opal is Translucent and Transparent while Black Opal is Translucent and Transparent in appearance.

Blue Gemstones

Blue Gemstones


Compare Blue Gemstones