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Fayalite and Chrysoberyl Optical Properties


Chrysoberyl and Fayalite Optical Properties


Optical Properties

Luster
Vitreous, Resinous   
Vitreous   

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

Dispersion
Not Available   
0.02   
24

Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.827-1.879   
1.746-1.763   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.042-0.051   
0.007-0.013   

Clarity
TransparentAnthony et al   
Transparent   

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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.

Yellow Gemstones

Yellow Gemstones


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