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Sillimanite
Sillimanite

Muscovite
Muscovite



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Sillimanite
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Muscovite

Sillimanite and Muscovite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Vitreous, Silky, Pearly
1.2 Pleochroism
Colourless to pale brown to yellow
Weak
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Transparent
1.5 Refractive Index
1.653-1.6851.552-1.618
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
0.020-0.022Not Available
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Sillimanite and Muscovite Optic Character

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

Similar to their colors, Sillimanite and Muscovite 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.