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Shigaite and Ettringite Optical Properties


Ettringite and Shigaite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Distinct   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Transparent, Translucent   

Refractive Index
1.546   
1.470-1.491   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Trigonal   

Birefringence
Not Available   
0.021   

Clarity
Not Available   
Transparent   

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Shigaite and Ettringite Optic Character

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

Similar to their colors, Shigaite and Ettringite 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, Shigaite is Not Available while Shigaite is Not Available in appearance.

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