Home
Gemstones


Obsidian and Petalite Optical Properties


Petalite and Obsidian Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Pearly   

Pleochroism
AbsentWalter Schumann   
AbsentWalter Schumann   

Dispersion
0.01   
29
0.01   
25

Transparency
Transparent, Translucent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.450-1.550   
1.502-1.523   

Optic Character
Not Available   
Not Available   

Crystal System
Amorphous   
monoclinic   

Birefringence
Not Available   
0.012-0.016   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

Benefits >>
<< Physical Properties

Obsidian and Petalite Optic Character

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

Obsidian and Petalite Transparency

Similar to their colors, Obsidian and Petalite 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, Obsidian is Translucent and Transparent while Obsidian is Translucent and Transparent in appearance.

Gems for Sagittarius

Gems for Sagittarius


Compare Gems for Sagittarius