Clinohedrite and Sillimanite Optical Properties

Clinohedrite

Sillimanite

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1 Optical Properties

1.1 Luster

Pearly

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Not Available

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

11.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Domatic H-M Symbol (m) Space Group: Aa

Orthorhombic

1.8 Birefringence

Not Available0.020-0.022

0 0.296

1.9 Clarity

Transparent

Clinohedrite and Sillimanite Optic Character

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

Similar to their colors, Clinohedrite 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, Clinohedrite is Transparent while Clinohedrite is Transparent in appearance.