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Chalcedony
Chalcedony

Sillimanite
Sillimanite



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Chalcedony
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Sillimanite

Chalcedony and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
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
Translucent, Translucent to opaque
Transparent, Translucent
1.5 Refractive Index
1.530-1.5431.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Orthorhombic
1.8 Birefringence
0.003-0.0090.020-0.022
Achroite
0 0.296
1.9 Clarity
Translucent
Transparent

Chalcedony and Sillimanite Optic Character

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

Chalcedony and Sillimanite Transparency

Similar to their colors, Chalcedony 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, Chalcedony is Translucent and Translucent to opaque while Chalcedony is Translucent and Translucent to opaque in appearance.