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Alunite and Demantoid Optical Properties


Demantoid and Alunite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Adamantine   

Pleochroism
Not Available   
None   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Gemmological Tables (2004)   

Refractive Index
1.572   
1.880-1.890   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
cubic   

Birefringence
0.020   
Not Available   

Clarity
Not Available   
TransparentUlrich Henn and Claudio C. Milisenda   

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<< Physical Properties

Alunite and Demantoid Optic Character

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

Similar to their colors, Alunite 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, Alunite is Not Available while Alunite is Not Available in appearance.

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