Sillimanite and Agate Opal Optical Properties

Sillimanite

Agate Opal

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1 Optical Properties

1.1 Luster

Vitreous, Subadamantine, Silky

Not Available

1.2 Pleochroism

Colourless to pale brown to yellow

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Transparent, Translucent

Translucent

1.5 Refractive Index

1.653-1.6851.37-1.52

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Not Available

1.8 Birefringence

0.020-0.022Not Available

0 0.296

1.9 Clarity

Transparent

Translucent

Sillimanite and Agate Opal Optic Character

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

Similar to their colors, Sillimanite and Agate Opal 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.