Pyrrhotite and Sillimanite Optical Properties

Pyrrhotite

Sillimanite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Not Available

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

Transparent, Translucent

1.5 Refractive Index

31.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Orthorhombic

1.8 Birefringence

Not Available0.020-0.022

0 0.296

1.9 Clarity

Not Available

Transparent

Pyrrhotite and Sillimanite Optic Character

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

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