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Zoisite and Danburite Optical Properties


Danburite and Zoisite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Greasy   

Pleochroism
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green   
Weak: pale yellow yellow   

Dispersion
0.02   
19
0.02   
22

Transparency
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.   
Gemmological Tables (2004) More from other references   

Refractive Index
1.685-1.707   
1.627-1.639   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.006-0.018   
0.006   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Zoisite and Danburite Optic Character

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

Similar to their colors, Zoisite 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, Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent while Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent in appearance.

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