Eosphorite and Sillimanite Optical Properties

Eosphorite

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Visible: X = yellow; Y = pink; Z = pale pink to colorless

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

1.639-1.6721.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.029-0.0320.020-0.022

0 0.296

1.9 Clarity

Transparent

Eosphorite and Sillimanite Optic Character

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

Similar to their colors, Eosphorite 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, Eosphorite is Transparent while Eosphorite is Transparent in appearance.