Verdite and Sillimanite Optical Properties

Verdite

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous, Silky

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Extreme

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

Transparent, Translucent

1.5 Refractive Index

1.5801.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c

Orthorhombic

1.8 Birefringence

Not Available0.020-0.022

0 0.296

1.9 Clarity

Translucent

Transparent

Verdite and Sillimanite Optic Character

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

Similar to their colors, Verdite 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, Verdite is Translucent while Verdite is Translucent in appearance.