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Dumortierite
Dumortierite

Sillimanite
Sillimanite



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Dumortierite
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Sillimanite

Dumortierite and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Subadamantine, Silky
1.2 Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
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
1.669-1.7231.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.011-0.0370.020-0.022
Achroite
0 0.296
1.9 Clarity
Translucent
Transparent

Dumortierite and Sillimanite Optic Character

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

Dumortierite and Sillimanite Transparency

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