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Gedrite and Demantoid Optical Properties


Demantoid and Gedrite Optical Properties


Optical Properties

Luster
Fibrous, Vitreous   
Adamantine   

Pleochroism
Weak to moderate   
None   

Dispersion
Not Available   
Not Available   

Transparency
Transparent   
Gemmological Tables (2004)   

Refractive Index
1.625-1.718   
1.880-1.890   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma   
cubic   

Birefringence
Not Available   
Not Available   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Gedrite and Demantoid Optic Character

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

Similar to their colors, Gedrite and Demantoid 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, Gedrite is Transparent while Gedrite is Transparent in appearance.

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