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Sillimanite
Sillimanite

Lepidolite
Lepidolite



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Sillimanite
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Lepidolite

Sillimanite and Lepidolite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Subadamantine, Silky
Vitreous, Pearly
1.2 Pleochroism
Colourless to pale brown to yellow
X = almost colorless; Y = Z = pink
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Transparent
1.5 Refractive Index
1.653-1.6851.525-1.587
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Triclinic
1.8 Birefringence
0.020-0.0220.0290-0.0380
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Sillimanite and Lepidolite Optic Character

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

Similar to their colors, Sillimanite and Lepidolite 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.