Tugtupite and Sillimanite Optical Properties

Tugtupite

Sillimanite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Subadamantine, Silky

1.2 Pleochroism

ModerateArthur Thomas

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueHerve Nicolas Lazzarelli

Transparent, Translucent

1.5 Refractive Index

1.494-1.5041.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

Orthorhombic

1.8 Birefringence

0.0080.020-0.022

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Transparent

Tugtupite and Sillimanite Optic Character

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

Similar to their colors, Tugtupite 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, Tugtupite is OpaqueHerve Nicolas Lazzarelli while Tugtupite is OpaqueHerve Nicolas Lazzarelli in appearance.