Friedelite and Sillimanite Optical Properties

Friedelite

Sillimanite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Subadamantine, Silky

1.2 Pleochroism

NilArthur Thomas

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

Transparent, Translucent

1.5 Refractive Index

1.627-1.6631.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Orthorhombic

1.8 Birefringence

0.032-0.0350.020-0.022

0 0.296

1.9 Clarity

Translucent

Transparent

Friedelite and Sillimanite Optic Character

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

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