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Iolite and Danburite Optical Properties


Danburite and Iolite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Greasy   

Pleochroism
Not Available   
Weak: pale yellow yellow   

Dispersion
Not Available   
0.02   
22

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

Refractive Index
1.52-1.56   
1.627-1.639   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
Not Available   
0.006   

Clarity
Transparent to translucent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Iolite and Danburite Optic Character

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

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Iolite and Danburite Transparency

Similar to their colors, Iolite and Danburite 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, Iolite is Translucent, Transparent and Transparent to translucent while Iolite is Translucent, Transparent and Transparent to translucent in appearance.

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