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Opal
Opal

Ettringite
Ettringite



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Opal
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Ettringite

Opal and Ettringite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Pearly
Vitreous
1.2 Pleochroism
None
Not Available
1.3 Dispersion
NoneNA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to translucent
Transparent, Translucent
1.5 Refractive Index
1.37-1.521.470-1.491
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Trigonal
1.8 Birefringence
Not Available0.021
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Opal and Ettringite Optic Character

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

Opal and Ettringite Transparency

Similar to their colors, Opal 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, Opal is Translucent, Transparent and Transparent to translucent while Opal is Translucent, Transparent and Transparent to translucent in appearance.