Vlasovite and Sillimanite Optical Properties

Vlasovite

Sillimanite

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1 Optical Properties

1.1 Luster

Greasy, Vitreous, Pearly

Vitreous, Subadamantine, Silky

1.2 Pleochroism

(x): colorless. (y): colorless. (z): colorless.

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent

1.5 Refractive Index

1.6071.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Orthorhombic

1.8 Birefringence

Not Available0.020-0.022

0 0.296

1.9 Clarity

Not Available

Transparent

Vlasovite and Sillimanite Optic Character

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

Compare Brown Gemstones

Vlasovite Vs Alabaster

Vlasovite Vs Adamite

Vlasovite Vs Allanite

Vlasovite and Sillimanite Transparency

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