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Crystal Opal
Crystal Opal

Sillimanite
Sillimanite



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Crystal Opal
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Sillimanite

Crystal Opal and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous, Subadamantine, Silky
1.2 Pleochroism
AbsentWalter Schumann
Colourless to pale brown to yellow
1.3 Dispersion
NoneNA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Transparent, Translucent
1.5 Refractive Index
1.370-1.1.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Orthorhombic
1.8 Birefringence
Not Available0.020-0.022
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Crystal Opal and Sillimanite Optic Character

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

Crystal Opal and Sillimanite Transparency

Similar to their colors, Crystal Opal and Sillimanite 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, Crystal Opal is Transparent while Crystal Opal is Transparent in appearance.