Bowenite and Sillimanite Optical Properties

Bowenite

Sillimanite

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Optical Properties

Luster

Waxy, Silky, Resinous, Greasy

Vitreous, Subadamantine, Silky

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.010.02

0.005 1

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Transparency

TranslucentHerve Nicolas Lazzarelli

Transparent, Translucent

Refractive Index

1.530-1.5751.653-1.685

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

-99990.020-0.022

0 0.296

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Clarity

TranslucentHerve Nicolas Lazzarelli

Transparent

Bowenite and Sillimanite Optic Character

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

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Bowenite and Sillimanite Transparency

Similar to their colors, Bowenite 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, Bowenite is TranslucentHerve Nicolas Lazzarelli while Bowenite is TranslucentHerve Nicolas Lazzarelli in appearance.