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Obsidian
Obsidian

Umbalite
Umbalite



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Obsidian
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Umbalite

Obsidian and Umbalite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Not Available
1.2 Pleochroism
AbsentWalter Schumann
Not Available
1.3 Dispersion
0.010.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
TransparentGemdat.org, Management Team (2012)
1.5 Refractive Index
1.450-1.5501.730-1.820
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Amorphous
Not Available
1.8 Birefringence
Not AvailableNot Available
Achroite
0 0.296
1.9 Clarity
Transparent
TransparentGemdat.org

Obsidian and Umbalite Optic Character

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

Obsidian and Umbalite Transparency

Similar to their colors, Obsidian and Umbalite 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.