Aventurine and Sillimanite Optical Properties

Aventurine

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Subadamantine, Silky

1.2 Pleochroism

AbsentWalter Schumann

Colourless to pale brown to yellow

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Translucent, Opaque . May be translucent when backlit on the edges.

Transparent, Translucent

1.5 Refractive Index

1.544-1.5531.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.007-0.0100.020-0.022

0 0.296

1.9 Clarity

Translucent

Transparent

Aventurine and Sillimanite Optic Character

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

Similar to their colors, Aventurine 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, Aventurine is Opaque . May be translucent when backlit on the edges. and Translucent while Aventurine is Opaque . May be translucent when backlit on the edges. and Translucent in appearance.