Fayalite and Chrysoberyl Optical Properties

Fayalite

Chrysoberyl

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous

1.2 Pleochroism

Faint

X = red; Y = yellow-orange; Z = emerald-green

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.827-1.8791.746-1.763

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.042-0.0510.007-0.013

0 0.296

1.9 Clarity

TransparentAnthony et al

Transparent

Fayalite and Chrysoberyl Optic Character

Fayalite and Chrysoberyl optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Fayalite and Chrysoberyl 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 Fayalite and Chrysoberyl 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. Chrysoberyl has Biaxial/+ character.

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Fayalite and Chrysoberyl Transparency

Similar to their colors, Fayalite and Chrysoberyl 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, Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al while Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.