Sillimanite and Pyrite Marcasite Optical Properties

Sillimanite

Pyrite Marcasite

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous, Subadamantine, Silky

Not Available

1.2 Pleochroism

Colourless to pale brown to yellow

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Opaque

1.5 Refractive Index

1.653-1.685Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Isometric

1.8 Birefringence

0.020-0.022Not Available

0 0.296

1.9 Clarity

Transparent

Opaque

Sillimanite and Pyrite Marcasite Optic Character

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

Compare Blue Gemstones

Sillimanite Vs Starlite

Sillimanite Vs Strontium Titanate

Sillimanite Vs Tanzanite

Sillimanite and Pyrite Marcasite Transparency

Similar to their colors, Sillimanite and Pyrite Marcasite 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.