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Ettringite and Annabergite Optical Properties


Annabergite and Ettringite Optical Properties


Optical Properties

Luster
Vitreous   
Subadamantine, Pearly   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
Not Available   

Refractive Index
1.470-1.491   
1.622   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
monoclinic   

Birefringence
0.021   
0.065   

Clarity
Transparent   
Not Available   

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Ettringite and Annabergite Optic Character

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

Similar to their colors, Ettringite and Annabergite 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, Ettringite is Translucent and Transparent while Ettringite is Translucent and Transparent in appearance.

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