Sillimanite and Shattuckite Optical Properties

Sillimanite

Shattuckite

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1 Optical Properties

1.1 Luster

Vitreous, Subadamantine, Silky

Silky

1.2 Pleochroism

Colourless to pale brown to yellow

X = very pale blue; Y = pale blue; Z = deep blue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Translucent

1.5 Refractive Index

1.653-1.6851.752-1.815

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.020-0.0220.063

0 0.296

1.9 Clarity

Transparent

Translucent

Sillimanite and Shattuckite Optic Character

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

Similar to their colors, Sillimanite and Shattuckite 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, Sillimanite is Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.