Titanite and Sillimanite Optical Properties

Titanite

Sillimanite

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1 Optical Properties

1.1 Luster

Subadamantine, Resinous

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Strong: X = nearly colorless; Y = yellow to green; Z = red to yellow-orange

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent

1.5 Refractive Index

1.885-1.9901.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Orthorhombic

1.8 Birefringence

0.105-0.1350.020-0.022

0 0.296

1.9 Clarity

Not Available

Transparent

Titanite and Sillimanite Optic Character

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

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