Home
Gemstones


Onyx and Phosgenite Optical Properties


Phosgenite and Onyx Optical Properties


Optical Properties

Luster
Vitreous   
Adamantine   

Pleochroism
Not Available   
Weakly pleochroic with O reddish and E greenish in thick sections.   

Dispersion
Not Available   
Not Available   

Transparency
Translucent, Opaque, Translucent to opaque   
Gemmological Tables (2004) More from other references   

Refractive Index
1.530-1.543   
2.117-2.145   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
tetragonal   

Birefringence
Not Available   
0.027   

Clarity
OpaqueHerve Nicolas Lazzarelli   
TransparentUlrich Henn and Claudio C. Milisenda   

Benefits >>
<< Physical Properties

Onyx and Phosgenite Optic Character

Onyx and Phosgenite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Onyx and Phosgenite 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 Onyx and Phosgenite 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 Gems for Capricorn

Onyx and Phosgenite Transparency

Similar to their colors, Onyx and Phosgenite 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, Onyx is Opaque, Translucent and Translucent to opaque while Onyx is Opaque, Translucent and Translucent to opaque in appearance.

Capricorn Gems

Capricorn Gems

» More Capricorn Gems

Compare Gems for Capricorn

» More Compare Gems for Capricorn