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Demantoid and Zoisite Optical Properties


Zoisite and Demantoid Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
None   
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green   

Dispersion
Not Available   
0.02   
19

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

Refractive Index
1.880-1.890   
1.685-1.707   

Optic Character
Not Available   
Not Available   

Crystal System
cubic   
Orthorhombic   

Birefringence
Not Available   
0.006-0.018   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Transparent   

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Demantoid and Zoisite Optic Character

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

Similar to their colors, Demantoid and Zoisite 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.

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