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Sillimanite
Sillimanite

Biotite
Biotite



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Sillimanite
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Biotite

Sillimanite and Biotite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Vitreous, Pearly
1.2 Pleochroism
Colourless to pale brown to yellow
Strong
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Not Available
1.5 Refractive Index
1.653-1.6851.565-1.625
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
0.020-0.0220.03-0.07
Achroite
0 0.296
1.9 Clarity
Transparent
Not Available

Sillimanite and Biotite Optic Character

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

Similar to their colors, Sillimanite and Biotite 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.