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Zoisite and Dumortierite Optical Properties


Dumortierite and Zoisite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

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

Dispersion
0.02   
19
None   

Transparency
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.   
Translucent, Translucent to opaque   

Refractive Index
1.685-1.707   
1.669-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.006-0.018   
0.011-0.037   

Clarity
Transparent   
Translucent   

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Zoisite and Dumortierite Optic Character

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

Similar to their colors, Zoisite and Dumortierite 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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