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Sillimanite
Sillimanite

Coral
Coral



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Sillimanite
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Coral

Sillimanite and Coral Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Not Available
1.2 Pleochroism
Colourless to pale brown to yellow
AbsentWalter Schumann
1.3 Dispersion
NANone
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Translucent
1.5 Refractive Index
1.653-1.6851.486-1.658
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Trigonal
1.8 Birefringence
0.020-0.0220.160-0.172
Achroite
0 0.296
1.9 Clarity
Transparent
Translucent

Sillimanite and Coral Optic Character

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

Sillimanite and Coral Transparency

Similar to their colors, Sillimanite and Coral 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, Sillimanite is Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.