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Black Opal and Amblygonite Optical Properties


Amblygonite and Black Opal Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Pearly   

Pleochroism
AbsentWalter Schumann   
weak to none   

Dispersion
None   
0.01   
26

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

Refractive Index
1.370-1.470   
1.578-1.646   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Not Available   
Triclinic   

Birefringence
Not Available   
0.020-0.030   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Black Opal and Amblygonite Optic Character

Black Opal and Amblygonite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Black Opal and Amblygonite 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 Amblygonite 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. Amblygonite has Biaxial/+ character.

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Black Opal and Amblygonite Transparency

Similar to their colors, Black Opal and Amblygonite 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.

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