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Hollandite
Hollandite

Sillimanite
Sillimanite



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Hollandite
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Sillimanite

Hollandite and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Not Available
Vitreous, Subadamantine, Silky
1.2 Pleochroism
Weak.
Colourless to pale brown to yellow
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Transparent, Translucent
1.5 Refractive Index
Not Available1.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Orthorhombic
1.8 Birefringence
Not Available0.020-0.022
Achroite
0 0.296
1.9 Clarity
Not Available
Transparent

Hollandite and Sillimanite Optic Character

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

Hollandite and Sillimanite Transparency

Similar to their colors, Hollandite 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, Hollandite is Not Available while Hollandite is Not Available in appearance.