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Boracite and Opal Optical Properties


Opal and Boracite Optical Properties


Optical Properties

Luster
Vitreous, Adamantine   
Vitreous, Pearly   

Pleochroism
None   
None   

Dispersion
Not Available   
None   

Transparency
Transparent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.658-1.673   
1.37-1.52   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Trigonal   

Birefringence
0.010-0.011   
Not Available   

Clarity
Transparent   
Transparent   

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Boracite and Opal Optic Character

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

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Boracite and Opal Transparency

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

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