Pezzotaite and Sillimanite Optical Properties

Pezzotaite

Sillimanite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Not Available

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent

1.5 Refractive Index

1.60-1.611.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

Not Available0.020-0.022

0 0.296

1.9 Clarity

Color grading system

Transparent

Pezzotaite and Sillimanite Optic Character

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

Similar to their colors, Pezzotaite 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, Pezzotaite is Not Available while Pezzotaite is Not Available in appearance.