Linarite and Sillimanite Optical Properties

Linarite

Sillimanite

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1 Optical Properties

1.1 Luster

Sub-Adamantine, Vitreous

Vitreous, Subadamantine, Silky

1.2 Pleochroism

X = pale blue; Y = blue; Z = Prussian blue

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

1.809-1.8591.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Orthorhombic

1.8 Birefringence

0.0500.020-0.022

0 0.296

1.9 Clarity

Transparent

Linarite and Sillimanite Optic Character

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

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