Sillimanite and Clinochlore Optical Properties

Sillimanite

Clinochlore

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1 Optical Properties

1.1 Luster

Vitreous, Subadamantine, Silky

Pearly, Greasy

1.2 Pleochroism

Colourless to pale brown to yellow

Distinct: light yellow-green to light bluE

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Transparent

1.5 Refractive Index

1.653-1.6851.571-1.597

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.020-0.022Not Available

0 0.296

1.9 Clarity

Transparent

Sillimanite and Clinochlore Optic Character

Sillimanite and Clinochlore optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Sillimanite and Clinochlore 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 Sillimanite and Clinochlore 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. Clinochlore has Biaxial/+ character.

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Sillimanite and Clinochlore Transparency

Similar to their colors, Sillimanite and Clinochlore 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, Sillimanite is Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.