Scheelite and Fayalite Optical Properties

Scheelite

Fayalite

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1 Optical Properties

1.1 Luster

Vitreous, Adamantine

Vitreous, Resinous

1.2 Pleochroism

Definite dichoric in yellow (yellow to orange-brown)

Faint

1.3 Dispersion

0.04NA

0.007 1

1.4 Transparency

Translucent, Transparent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.918-1.9361.827-1.879

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

Orthorhombic

1.8 Birefringence

0.0160.042-0.051

0 0.296

1.9 Clarity

Translucent

TransparentAnthony et al

Scheelite and Fayalite Optic Character

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

Similar to their colors, Scheelite and Fayalite 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, Scheelite is Translucent and Transparent while Scheelite is Translucent and Transparent in appearance.